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Professor OakGrandfather of Green and Daisy, he's full name is Samuel Oak. He is a researcher who invented the Pokédex and sent out Red on his journey. He has a long history with Agatha, Pryce, and the Johto Daycare couple.
Daisy OakGreen's older sister.
BillThe technical genius who invented the storage system.
BrockThe Gym Leader of Pewter City, he trains with Rock Pokémon and is also a security guard for the Pewter City Museum.
MistyThe headstrong Gym Leader of Cerulean City, specializing in Water types. She is perhaps Red's first real ally and gave him her Gyarados, which he still keeps in his party to this day.
ErikaAn elegant lady, Erika is the Gym Leader of Celadon City who specializes in Grass types. She also teaches at her city's university and serves as supervisor for the rest of her region's Leaders.
BlaineAn old scientist who used to work for Team Rocket, this fire specialist defected offscreen as he got sick of working for them.
JanineKoga's daughter, who takes over the Fuschia Gym after his disappearence. Like her father, she specializes in poison types. She also works as a part-time freelancer ninja.
Jr. Trainer Evan/Phil (Junji)A trainer whose Haunter was lured away by Agatha at the Power Plant. After some help from Green, he managed to get it back. He then became one of Blaine's assistants on Cinnabar Island.
Super Nerd Miles/William (Akihito)Was Erika's Rival and the one hired by Agatha to disguise as Red and recapture his Pikachu. Later becomes good friends with Evan.
Professor ElmThe Pokémon professor of the Johto region, Elm was unfortunate enough to be robbed of Totodile by Silver and could only watch as Gold took Cyndaquil to track him down.
FalknerFirst appearing as a police officer, Falkner befriends Gold who helps him catch a Skarmory. He later uses it to pass the Gym Leader exam and becomes the Leader of the Violet City Gym. Looks up to his father (implied to be Wayne, an old friend of Chuck's), who was a policeman.He befriends Janine after their battle, and they bond due to their father issues (ironically in the games themselves, they are seen arguing over whose father is better).
BugsyThe Gym Leader of Azalea Town, who first appears as an archaeologist, Bugsy meets Gold at the Ruins of Alph. Specializes in bug-types.
WhitneyA somewhat childish Gym Leader who specializes in normal types, Whitney is the only Gym Leader aside from Pryce who Suicune doesn't challenge. She sometimes helps her good friend DJ Mary on radio shows.
MortyA trainer with clairvoyant psychic abilities, Morty is the Leader of the Ecruteak City Gym. Specializes in ghost-types.
ChuckThe Gym Leader of Mahagony Town, who specializes in fighting-types. Chuck was the one who taught Green how to train Pokémon. He runs a dojo.
JasmineThe Olivine City Gym Leader who was caught in Ecruteak City earthquake, she had to save herself because Gold and Silver were too busy fighting over who would save her. She specializes in the steel-type, though she has other types on her team. Her part-time job is looking after the Sparkle Lighthouse.
PryceThe Leader of Mahogany Town's Gym, Pryce specializes in ice-types. A frail old man in a wheelchair. Or is he?
ClairLance's cousin, Clair shares his affinity for dragon-types. Gym Leader of Blackthorn City Gym.
Crystal's momA hyper woman with a rather childish demeanor, Crystal's mom can still be serious when the time calls for it.
EusineA Trainer in pursuit of the legendary Pokemon Suicune. He formed a rivalry with Crystal during the events of the Crystal arc,but by the end of the arc they become on much friendlier terms with each other. He also has a more minor role in the HGSS arc where he encounters Silver.
Professor BirchThe Hoenn Pokémon professor, and father of Sapphire. Unlike the previously mentioned professors, he seems to do much more field work.
WallyA major supporting character who at one point temporarily holds a Pokedex. Ruby helps give him some Pokémon training when Norman (who doesn't show up until after Ruby's gone, much to his relief) rejects training him, but the two get separated soon thereafter. His "starter" is Ruby's Ralts, Ruru, who was eventually returned to her true trainer. His first Pokémon is a Kecleon.
Gabby and Ty
(Maryanne and Tyler in the Chuang Yi version).A reporter and her cameraman, these two ally themselves with Ruby and Sapphire early on, determined to find out who is reponsible for reeking havoc in Hoenn.
RoxanneGym Leader of Rustboro City, Roxanne graduated from the Trainer's School and is thus very knowledable. As part of her gym challenge, any challengers much pass a written exam before battling her.
BrawlyLeader of Dewford Town's gym, Brawly specializes in fighting types. He usually trains his Pokémon by surfing with them. He is apparently a disciple of Bruno's.
WattsonA jolly old man who specializes in Electric types, Wattson is pun-cracking Gym Leader of the Mauville Gym.
FlanneryFire-type using Gym Leader of Lavaridge Town, Flannery tried to protect the fires of Mt. Chimney from Team Aqua, but failed.
NormanRuby's father and a normal type specialist, Norman was just became Gym Leader of Petalburg City when Ruby ran away from home, for which he swore to hunt him down. Afterwards, he trains Wally to be a Pokémon trainer.
WinonaSupervisor of the Hoenn Gym Leaders much like Erika is of Kanto's, Winona is the Fortree City Gym Leader. She specializes in flying types.
Tate & LizaTwins who share the title of Gym Leader of Mossdeep City, Tate and Liza act as the guardians of Mt. Pyre. Afterwards, they help train Ruby and Sapphire for their battle with Groudon and Kyogre.
WallaceA contest master and water specialist, Wallace was originally the region champion, but gave it up so he could be
JuanWallace's mentor and the previous Sootopolis Gym Leader as well as a Water-type specialist. He takes the position again when Wallace decides to take up the Champion position once more. He trains Ruby and Sapphire, both physically and mentally, for the final battle.
Steven StoneThe current Hoenn League Champion and steel-type specialist, who normally spends his time searching for rare stones. He is tasked with awakening the three Regis to help stop the battle between Kyogre and Groudon.
SidneyOne of the Hoenn Elite Four. Specializes in Dark-types.
PhoebeOne of the Hoenn Elite Four. Specializes in Ghost-types.
GlaciaOne of the Hoenn Elite Four. Specializes in Ice-types.
DrakeOne of the Hoenn Elite Four. Specializes in Dragon-types.
Swimmer JackMeets and befriends Ruby.
Hoenn Battle Frontier
ToddA photographer who follows Emerald on his Battle Frontier challenge.
ScottThe owner of the Battle Frontier, he can recognize a trainer's potential. Often acts in his own interest in order to make his Battle Frontier a success.
NolandOne of the seven Frontier Brains, also known as Factory Head Noland. He is in charge of the Battle Factory, and also takes care of all the rental Pokémon used in the Battle Frontier facilities.
LucyAlso known as Pike Queen Lucy, she is in charge of the Battle Pike, and favors snake-like Pokémon.
BrandonA rough, adventurous man in charge of the Battle Pyramid, he is also known as Pyramid King Brandon. Has a particular dislike for Emerald at first.
GretaArena Tycoon Greta is the Frontier Brain for the Battle Arena.
TuckerThe flamboyant Dome Ace of the Battle Dome, he also harbors a grudge against Emerald after their confrontation on the first day.
SpenserA mysterious tattooed man also known as Palace Maven Spenser, he's the head of the Battle Palace.
AnabelThe Salon Maiden of the Battle Tower and The Leader of the seven Frontier Brains.
Professor RowanThe resident professor of Sinnoh.
Sir BerlitzRowan's assistant and Platinum's father, he is the richest man in Sinnoh.
Paka and UjiPlatinum's hired bodyguards. They tail the protagonists after a mix-up causes their charge to go with Diamond and Pearl.
RoarkGym Leader of the Oreburgh Gym and foreman of the local mines. He specializes in Rock-type Pokémon. He is Byron's son.
GardeniaGym Leader of the Eterna Gym. She specializes in Grass-type Pokémon.
MayleneGym Leader of the Veilstone Gym. She specializes in Fighting-type Pokémon.
Crasher WakeGym Leader of the Pastoria Gym. He specializes in Water-type Pokémon. He later trains Pearl following the events in Lake Valor.
FantinaGym Leader of the Hearthome Gym. A ghost-type specialist who also enjoys contests. Like Cynthia, she is very fond of the Sinnoh Trio and looks out for them whenever they're in the neighborhood.
ByronGym Leader of the Canalave Gym and the father of Roark. He hands out the Mine Badge to Trainers who defeat him. He specializes in Steel-type Pokémon.
CandiceGym Leader of the Snowpoint Gym. She specializes in Ice-type Pokémon. It is her duty to watch over Lake Acuity and Snowpoint Temple.
VolknerGym Leader of the Sunyshore Gym. He specializes in Electric-type Pokémon. He has been depressed since he hasn't had a good fight in ages and is constantly looking for something to regain his excitement back.
LookerMember of the International Police and helps Platinum investigate the Distortion World so he can find information on Team Galactic.
BebeThe Sinnoh Pokémon storage system developer. She is good friends with Green's sister, Daisy.
AaronMember of the Sinnoh Elite Four. Specializes in Bug-type Pokemon.
BerthaMember of the Sinnoh Elite Four. Specializes in Ground-type Pokemon.
FlintMember of the Sinnoh Elite Four and is a friend of Volkner. Specializes in Fire-type Pokemon.
LucianMember of the Sinnoh Elite Four. Specializes in Psychic-type Pokemon.
CynthiaThe Champion of the Sinnoh region's Elite Four. She also seems to travel around Sinnoh a lot, helping both people and Pokémon. She meets the Sinnoh Trio and looks out for them.
Sinnoh Battle Frontier
PalmerThe Tower Tycoon of Sinnoh's Battle Tower. He is the father of Pearl.
DarachButler of Cailtin and battles in her place in the Battle Castle as the Castle Valet.
CaitlinFrontier Brain of Sinnoh's Battle Castle. Due to her powerful Psychic Powers, she is not allowed to battle or else her abilities will go out of control. She later becomes one the Elite Four of the Unova region.
DahliaArcade Star of Sinnoh's Battle Arcade. She loves to dance and it extends to her Pokémon as well.
ThortonFactory Head of Sinnoh's Battle Factory. Uses machines to help calculate the probabilities of his chances in battle.
ArgentaHall Matron of Sinnoh's Battle Hall.
RileyA friend of Byron's that was asked to help train Diamond in battling before he goes to Lake Verity. He has the ability to use Aura.
Professor JuniperThe regional professor of Unova.
CherenAlong with Bianca, he is a childhood friend of Black and chose Snivy as his starter Pokemon (Actually, Bianca chose it for him).
BiancaAlong with Cheren, she is a childhood friend of Black and chose Oshawott as her starter Pokemon.
FennelProfessor Juniper's friend and former classmate. She works with her assistant, Amanita, and researches about dreams.
Cedric JuniperProfessor Juniper's father.
Cilan, Chili, & CressThe triplet gym leaders of Striaton Gym.
LenoraGym Leader and Museum owner of the Nacrene City Gym.
BurghGym Leader of the Castelia City Gym.
ClayGym Leader of the Driftveil City Gym.
SkylaGym Leader of the Mistralton City Gym. She's also the pilot of a cargo company.
BrycenGym Leader of the Icirrus City Gym.
DraydenGym Leader of the Opelucid City Gym.
IrisIris is the protégé of Drayden, though she also learned spirituality from Alder. She respects both men very much.
MarlonA cheerful man who initially appears as a League participant.
Emmet and IngoThe Subway bosses of the Battle Subway.
ShauntalGhost-type Elite Four member of Unova.
GrimsleyDark-type Elite Four member of Unova.
MarshalFighting-type Elite Four member of Unova.
AlderChampion of the Unova Pokemon League.
ShaunaAn aspiring Furfrou groomer, and childhood friends with a number of other characters.
ViolaThe Gym Leader of Santalune City, the gang initially isn't very fond of her as she works for the press along side of her sister, but they agree to her offer of help.
MewtwoA Psychic-type Pokemon that was cloned from the legendary Pokemon Mew. Using some cells from his own arm, Blaine managed to complete the Pokemon while it was being created and created a bond between the two that allowed them to sense whenever the other is nearby.
Raikou, Entei, and SuicuneA trio of legendary Pokemon that died during the fires that burned down the Brass Tower. They were revived into their current forms by Ho-Oh, who they revere as their master.
DeoxysTwo Pokemon mutated from a space virus. They were encountered by Team Rocket and were used to help Giovanni find his missing son. Main Legendary of the fifth chapter, FireRed & LeafGreen.
JirachiA Pokemon that Emerald sought after to revive his senior Dex holders. Main Legendary of the sixth chapter, Emerald.
Dialga and PalkiaTwo Pokemon sought after by Cyrus so he can achieve his goal to create a new world. After summoning them, he controlled them with the Red Chain and forced them to fight until Time and Space began to distort. They were eventually freed by the efforts of Diamond, Pearl, and Platinum and were taken into the Distortion World by Giratina.
GiratinaA Pokemon roaming the Distortion World, an alternate dimension.After Cyrus' defeat, Giratina appeared from a hole between dimensions and pulled Cyrus, Dialga, and Palkia into it. Platinum is investigates it because she believes that her bodyguards are trapped in the Distortion World.