->''"Welcome to the next generation of Pokémon! As a rookie Pokémon Trainer, you will need to catch, train and battle Pokémon on your journey to become the Pokémon League Champion. You will face many challenges along the way, as you search for the Pokémon that rules time or space..."''
-->-- '''Blurb''' on the back of the boxes of ''Pokémon Diamond and Pearl Versions''

The fourth generation of ''Franchise/{{Pokemon}}'' games, ''Diamond and Pearl'' hit the NintendoDS in 2006. Taking place in Sinnoh, the Pokémon world version of the Japanese island of Hokkaido, the plot is familiar territory for the series: [[HelloInsertNameHere you]], a child from the modest little village of Twinleaf Town, and your [[TheRival hyperactive best friend]], have a fateful encounter with Professor Rowan, the local authority on Pokémon, and his well-meaning but inexperienced assistant. Said encounter leaves you both with your first [[{{Mon}} Pokémon]], so naturally you set out ToBeAMaster, collecting monsters and badges and challenging/defeating opposing Trainers along the way.

At some point you also encounter Team Galactic, a group that claims to be researching new forms of energy, but isn't above [[CardCarryingVillain unabashedly illegal acts in broad daylight]]... what exactly are their goals? As the PlayerCharacter, naturally your hero's on a crash course to find out...

A [[RuleOfThree third version]], titled ''[[UpdatedRerelease Platinum]]'', came out a couple years down the line. ''Platinum'' tweaked the storyline a bit, adding more characters, remodeling several Gyms, and naturally including new challenges for players.

Not to be confused with seasons 10 through 13 of the ''{{Anime/Pokemon}}'' anime[[note]]''Pokémon: Diamond and Pearl''; ''Pokémon: Diamond and Pearl: Battle Dimension''; ''Pokémon: Diamond and Pearl: Galactic Battles''; and ''Pokémon: Diamond and Pearl: Sinnoh League Victors''[[/note]], but Pokémon from this era do show up in the show. For the bootleg under the name ''"Pokemon Diamond"'', see ''VideoGame/{{Telefang}}''.
!!Tropes used in ''Diamond'', ''Pearl'' and ''Platinum'':
* AntiFrustrationFeatures:
** From these games onward, your BagOfHolding no longer has a limit.
** If you knock out a Legendary, it will return to the place you encounter it after beating the Pokémon League again.
* AdultFear: A post-game encounter in ''Platinum'' with an elderly man who laments that he knew his grandson was living in an emotionally unhealthy home (whether it was abusive or just that severely neglectful is left to speculation), but didn't do anything to help until it was already too late to save him. It's heavily implied that his grandson is Cyrus, the BigBad of the game. Imagine living with the guilt of knowing you could have prevented that and ''didn't''.
* ApatheticCitizens: Downplayed. Most people said that Team Galactic was "up to no good". A lot of them probably didn't realize the scale of their mission, since the worst they did in public was steal a Pokémon from a kid. In Platinum, it does seem that the government is at least trying to do something by sending a detective/secret agent on their trails. Inverted in that most of Team Galactic's own members had no idea what they were actually doing and would have probably freaked out if they had known.
* ArtificialBrilliance: Enemy trainers tend to give their Pokémon moves that can cope with their weaknesses. And yes, they ''will'' use it on ''you''.
* {{Bowdlerise}}: The P.I. Trainer class. Pay attention to how they talk about chance and how they are flipping a coin in their sprite and you'll realize that they are actually supposed to be the Gen IV version of the Gambler class. Their resemblance to a detective was [[LuckyTranslation purely coincidental]].
* BreakoutCharacter: Lucario's popularity surged to the point where it essentially became the mascot of the generation. It got movie focusing on it, was included in SuperSmashBrosBrawl, and was even included as a gift Pokemon in ''Black and White 2.''
* BrokenBridge: Where to begin. Besides the usual staples of the series like HM moves that are needed to progress through an area, or random mooks [[NPCRoadblock standing in the way]]...
** Route 210 is blocked by a group Psyduck, which you could defeat easily, but instead you have to get a Secret Potion because they have headaches.
** A man next to route 222 won't let you pass because of a blackout in Sunyshore City until after you've beaten the BigBad. This one is at least ''slightly'' justified by the fact that not only did Volkner cause the blackout, it likely would have shut down his gym, meaning there would be little point in going to Sunyshore anyway.
** Random people block your way for no legitimate reason. Route 212 is blocked from the northern side, even after you've beaten Hearthome City's Gym, just to make you take a longer path. No badges, no special events, nothing.
** In Platinum, a battle is blocking the entrance to Canalave City if you manage to Surf there before picking up the HM from Celestic Town.
** Also in Platinum, after you escape from the Distortion World, you're placed outside the entrance to Turnback Cave. Cynthia just happens to be standing in front of the entrance, and will remain standing there until you defeat her at the Pokémon League.
* BubblegloopSwamp: The Great Marsh, as well as some of Route 212.
* ButThouMust:
** When you get the Old Rod and Good Rods on Routes 218 and 209 respectively, the Fishermen will ask you if you need an explanation on how to use the rods. Even if you say no, they'll still blab on about them.
** When you get to the end of Iron Island and Riley offers you the Riolu egg, if you say no, he'll "insist". You have to say yes, even if you have a full party, in which case he'll wait until you come back with a free spot.
** In ''Platinum'', Cynthia will stop you from going to the bike shop unless you accept the Togepi egg.
* CanonDiscontinuity: If ''[[VideoGame/PokemonBlackAndWhite Black and White]]'' are any indication, ''Platinum'' is the canonical game, and ''Diamond and Pearl'' exist in discontinuity.
* CaptureTheFlag: A minigame in the Underground.
* CharacterSelectForcing: There are only 2 Fire-type families in the region before the post-game, the Ponyta and Chimchar lines, one of which is a starter. This had to be known by [=GameFreak=], as they made one of the Elite Four a Fire-type user and only 2 of his Pokémon are actually Fire-type, and it doesn't actually include every Pokémon introduced in Generation IV. This was fixed in Platinum.
* TheComputerIsACheatingBastard:
** The Battle Frontier in Platinum. It's in the game's programming to continually stack the odds against you more and more the higher your win streak goes.
** A P.I. on Route 214 has a Level 30 Goldeen in Platinum with Horn Drill, which doesn't learn that move until Level 41.
** The team Galactic admins have Pokemon at levels way before they should be available-- Purrugly and Skuntank at level 17 or so when neither is supposed to evolve until its 30s.
* DarkerAndEdgier: The story is noticeably darker than previous entries in the series, with the BigBad being a manipulative psychopath aiming to ''destroy the universe'' and recreating it.
* TheDevTeamThinksOfEverything:
** Platinum has a place in the post-game area called the Battleground that randomly picks 3 of the Gym Leaders and 1 of the "Stat Trainers" every day for you to battle. If Roark and Byron are both in the Battleground on the same day their post-battle dialog changes.
** If you run away from Giratina when you're supposed to fight[=/=]catch it in the Distortion World, Cyrus will comment on it.
* DifficultySpike: The Elite Four and Champion are ''much'' harder compared to the eight Sinnoh Gym Leaders, due to a sizable level difference between them and the trainers in Victory Road which may leave your team under-leveled if you didn't do any LevelGrinding.
* FantasyCounterpartCulture: Geographically Sinnoh is a counterpart to Hokkaido, Japan.
* ForcedTutorial: Annoying as always, but the really annoying part is that you can have already captured Pokémon by the time it is given and your tutorial giver ''makes no mention of it''.
* GameBreakingBug:
** Chatot's SecretArt, Chatter, can actually break the game due to glitches, and therefore it is banned from use in Random [=WiFi=].
** ''Platinum'' only, and carried over to ''[=HeatGold=] and [=SoulSilver=]''; the [[http://bulbapedia.bulbagarden.net/wiki/Acid_rain Acid Rain glitch]] will cause every weather to activate at once if a Pokémon faints to [[YouWillNotEvadeMe Pursuit]] while attempting to switch out if a weather is in play during a PlayerVersusPlayer battle. If Castform or Cherrim are sent out after the glitch has been triggered they will constantly transform due to their abilities being weather-dependent and cause the battle to lock up, requiring a restart.
* GravityScrew: The Distortion World in ''Platinum'' has various sections where the gravity will shift.
* GuideDangIt: There's a trick to make the same monster pop up repeatedly while using the Poké Radar. Combine it with a trick that increases the likelihood of held items appearing, and performed in the spot where wild Chanseys appear, and the [[ExperienceBooster Lucky Egg]] can be obtained with an hour's work if your luck is poor (when it was nigh impossible to obtain in previous games). The first trick can also eventually make a shiny Pokemon appear, but it takes considerably more work. Naturally, neither trick is alluded to anywhere in-game, nor is it mentioned in official guides.
* IncrediblyLamePun:
** "As we skiers like to say, 'spur thing!'"
** Also, from a Birdkeeper with a Noctowl: "We'll show you 'owl' best!"
* InnBetweenTheWorlds: You know that one inn in Canalave with the worn-out sign and the perpetually locked door?
* LoadsAndLoadsOfLoading:
** This set of games has small, but noticeable, wait times ''everywhere'', including 15 second save times. There's also considerable lag in battles between animations, even with the animations ''off''. Fixed in ''Platinum''.
** ''Diamond and Pearl'' may give you a message when you save that it's "saving a lot of data," which means it will take about three times as long to load. This caused by the Box System. If you catch a Pokémon and it's sent to the box, prepare to take a while to save. If you look at the Box System for one second and don't even bother ''touching'' anything, prepare to take a long while to save. If you go ''hours'' on your journey without bothering to mess with the Box System, you'll save in a few seconds. This is because doing anything with the boxes triggers a flag that causes the game to calculate the checksums of all boxed Pokémon data on the next save, to make sure nothing got corrupted. It's a good programming practice [[UpToEleven taken into overdrive]].
* LovecraftLite:
** EldritchAbomination:
*** Darkrai. Simply by being in the presence of a sleeping person, it will give them nightmares.
*** As of ''Platinum'', Giratina, less of a downplay than the former. It lives in an EldritchLocation where time, space, and gravity don't apply. [[WordOfGod Satoshi Tajiri]] says that it's the personification of antimatter, and it's on par with [[PhysicalGod Dialga and Palkia.]]
*** The Lake Guardians.
--->Look not into [Uxie]'s eyes. In but an instant, you'll have no recollection of who you are. Return home, but how? When there is nothing to remember?\\
Dare not touch [Mesprit]'s body. In but three short days, all emotions will drain away.\\
Above all, above all, harm not [Azelf]. In a scant five days, the offender will grow immobile in entirety.
** EldritchLocation: Distortion World. Whatever world Dialga and Palkia come from. What sort of place can you think of that "gives off an overwhelming feeling of time/space"?
* LuckBasedMission:
** If you want the TM for [[TakingYouWithMe Explosion]], you have to play the slots. Not just to grind for enough coins, but to trigger TEN straight bonus rounds, and your chain can be broken simply due to bad luck.
** Super Contests, most of all the Acting Competition since bonus points are awarded based on how few other Pokemon choose the same judge. The Visual Competition, though primarily dependent on Poffin feeding, also depends on what theme you get since the opponents choose the same accessories every time (and which accessories correspond to which theme are [[GuideDangIt not always intuitive]]). The only part that isn't particularly luck-based is the Dance Competition, which can possibly make up for lost ground in the other two sections.
** The 5-Maid Knockout Exact-Turn Attack Challenge in ''Platinum'' pits you against a series of five Maids, all of whom have a single Clefairy. In order to beat the challenge, you have to defeat all five in a randomly-determined number of turns -- no more, no less. Sounds easy, right? Unfortunately, every single Clefairy has access to moves like [[NoSell Endure]] or Bounce that they can use to stall for time. Even with [[OlympusMons max-level dudes]] capable of single-handedly wiping the floor with the Elite Four, if your opponents use those moves often enough, you fail. Of course, your only reward for beating the challenge is another battle against someone who has a Blissey (though they shell out plenty of cash and you can steal a RareCandy from the Blissey, if you're so inclined).
%%* MindScrew: The Distortion World in ''Platinum''.
* MythologyGag:
** Three Trainers from the ''Anime/PokemonJirachiWishmaker'' and ''Anime/PokemonDestinyDeoxys'' movies of the ''Anime/Pokemon'' appear as Ace Trainers in the Battle Zone. Butler and Diane from movie 6 appear on Route 229, the two of them sharing four of the Pokémon Butler owned in the movie. Rebecca (named "Hitomi" in Japan) from movie 7 appears on Route 224 with her Metagross. The English translation team did not notice this EasterEgg however, as Butler and Diane are renamed "Felix" and "Dana", respectively, and Rebecca/Hitomi is renamed "Jamie" instead.
%%** Insert Red Gyarados reference here.
** One of the guard in the houses connecting routes will complaining about his thirst. [[VideoGame/PokemonRedAndBlue Luckily, he's not on duty, so he can't stall your progress.]]
* NeverRecycleABuilding: The Old Chateau was abandoned several decades ago (at least), yet still stands more or less untouched since it was vacated despite being literally on Eterna City's doorstep. This probably has something to do with the fact that it became overrun with Ghost Pokémon at some point.
* ObviousBeta: The battles take a long time even with the animations off and saving takes a while.
* ObviousRulePatch:
** The move Chatter is banned from Random WiFi since it can cause glitches that can break the game.
** These games introduced the Physical[=/=]Special split, which determine DamageTyping based off the individual move rather than the ElementalRockPaperScissors chart (i.e. previously all Water moves were Special but now some aren't).
** In ''Platinum'', Sinnoh's Regional Pokédex was expanded to include more variety, especially Fire-types (there were only 2 families in ''Diamond and Pearl'', one of which was Chimchar's). This also allowed the Gym Leaders that had Pokémon that weren't their official type to be replaced with those that actually are.
** Hypnosis' accuracy was reduced to 60% in ''Platinum'' after ''Diamond and Pearl'' increased it to 70%.
* OldSaveBonus:
** The Pal Park feature allow the player to transfer Pokémon from the third generation by inserting one of the games in the GBA slot.
** By completing [[VideoGame/PokemonStadium Pokémon Battle Revolution]], the player can receive a Pikachu that knows Surf via Mystery Gift.
* OneHundredAndEight: Diamond version's Pokedex description of Spiritomb is "A Pokemon that was formed by 108 spirits. It is bound to a fissure in an Odd Keystone."
* OlympusMons: Literally with [[TimeMaster Dialga]], [[RealityWarper Palkia]], [[EldritchAbomination Giratina]], and '''especially''' [[{{God}} Arceus]].
* PoliceAreUseless: Looker, the International Police officer, doesn't accomplish much besides telling you where Galactic is so you can go beat them up. In ''Platinum'', it's subverted: he appears out of nowhere at [[spoiler:Stark Mountain]] with a squad of cops and [[AntiClimax drags a Galactic commander off to prison before you can fight him]].
* {{Rewrite}}: ''Platinum'' changes the circumstances of how you obtain your starter, possibly to avoid any FridgeLogic when you meet Looker. [[note]]In ''Diamond''/''Pearl'', you swipe your starter from Rowan's briefcase to defend yourself from a wild Starly attack, meaning you took them without permission; Rowan's comments afterward imply he only "gives" them to you because they've already imprinted on you and wouldn't work with anyone else anyway. ''Platinum'', by contrast, has him giving them to you directly.[[/note]]
* SequelDifficultyDrop: The post-game battle facilities. Previously, you had to make sure that all your Pokemon were at the same level (the [=NPCs=]' levels would be the same as the strongest Pokemon in your team, similar to the ''Stadium'' games), and this level had to be above the base level for all [=NPCs=], 60. Now, you simply have to get them to at least Lv. 50, and the game will bring down any higher leveled Pokemon. The Frontier has been reduced from 7 facilities to 5, none of which have gimmicks anywhere near as frustrating as in ''Emerald'', like the Battle Palace shunning player input so the Pokemon can attack based on their Natures, or the Battle Pyramid's BlackoutBasement.
* SequelDifficultySpike: This is the point when [=NPCs=] really started taking advantage of [=TMs=], Tutor moves, and Egg moves. Combined with the highest level curve since Gen I (which had poor AI and generally restricted move pools to naturally learned moves), Gen IV proved to be quite the challenge.
* SequelHook: [[spoiler: Cyrus is never apprehended and is still somewhere in the Distortion World. His last lines to the player imply he'll try something again.]]
* SharedFamilyQuirks: TheRival, like his father, is always in a hurry and always bumps into people.
* SheatheYourSword: An interesting variation. It is perfectly possible to move the plot forward in Platinum by defeating or capturing Giratina, but you can also simply refuse to fight it by running. The game, through Cyrus being astounded at simply choosing to not fight it making Giratina come to its senses, will acknowledge this decision.
* ShoutOut
** There's a Trainer in the post-game part of Victory Road that wants to [[AustinPowers judo chop]] you.
** One of the Galatic Grunts makes a reference to Sony's most famous E3 presentation.
--> "In return, we'll refrain from causing [[ForMassiveDamage massive damage]] to your assistant."
%%** The substantial amounts of shout-outs to internet terms and memes can be explained by the fact that the lead translator is a Website/SomethingAwful regular.
%%*** One specific SA reference is with the Interviewers that can be battled in the Jubilife TV station - since the female of the pair uses a Wooper, her name was translated as "Roxy", after the player character from LetsPlay/Chorocojo's LetsPlay of ''Pokémon Crystal''.
** The area in which the most powerful Steel Pokémon is found is called [[ComicBook/IronMan Stark Mountain]].
** The Pokemon Rotom is clearly based on ''Pulseman'', and one possible translation of Team Galactic's name is "Galaxy Gang". And speaking of Pulseman, a bit of the Pulseman overworld music is used in the 2nd last part of the rival's (Barry's) battle theme.
** On Iron Island, there is a worker named Noel who says that he is [[{{Music/Oasis}} a working-class hero]].
** [[Series/DoctorWho Who]] does Looker remind you of?
* SNKBoss: Cynthia, who even today is still widely regarded as the hardest Champion to date. If there's any Champion who your battle with is all but sure to be a thrill you'll never want to forget, it's her. Unlike most other champions (particularly the ones from the later generations), her team is very well balanced and can handle most types with ease, including [[ThatOneBoss Garchomp]].
* SpikesOfVillainy: Team Galactic buildings have big honking spikes sticking out from their sides.
* SpritePolygonMix: The characters and some props are sprites while the buildings and overworld are 3D models.
* SuspiciouslySpecificDenial: The lady at the front desk of the Canalave Library, after the earthquake.
--> "It certainly wasn't me who screamed 'Gyaaah!!' or shouted 'Help meee!!' No really, that wasn't me screaming!"
* {{Troll}}: A lady will trade her Haunter for a Medicham in Snowpoint City. [[SocializationBonus Expect a Gengar without having to buy another game/trading with friends?]] '''Too bad'''. Said Haunter holds an Everstone, so it will not evolve. Even the NPC is apathetic about it.
* ThirdPersonPerson: Mira, one of the possible Trainers you can team up with during your journeys, will speak like this.
* UnsoundEffect / VisibleSilence: When visiting Dr. Footstep. instead of speaking, a few voiceless Pokémon will say, "Ssshhhnnn... ... Ssshhhnnn... ... Ssshhhnnn... ...", which is similar to the Japanese "sound effect" for silence.
* WhatMeasureIsANonCute: Only a handful of 'cute' Pokémon can play in Amity Square. In ''Diamond and Pearl'', even the ''starters'' were excluded; this was fixed in ''Platinum'', even allowing you to take all their evolved forms for a walk. Still, this makes for a grand total of ''11 or 20 out of 493'' getting to go for a stroll.
** {{Lampshaded}} by an angry Trainer who complains about not being able to take his Gyarados or Steelix into the park.
** Even Pokémon like ''Pichu'' aren't able to go inside. Yet Psyduck and Shroomish are. And Torchic, despite not being available naturally in-game. And the rumored child-abductors Drifloon.
* AWinnerIsYou: Quoted by a clown in Veilstone when he gives you the Coin Case.