History NightmareFuel / PokemonPokedex

* The cute, huggable cotton blob that is Jumpluff meets an unfortunate fate in the wild. It travels on seasonal winds, and once its cotton spores run out, its journey ends, ''[[SecretlyDying as does its life]]''.

* Similar to the above, many Mega Evolutions' Pokédex entries are horrifying, either implying, or outright stating, that you've turned your beloved Pokémon into a beast that knows nothing but the thrill of the fight, suffers from injurious levels of PowerIncontinence can attack their own Trainer and/or even suffers because of the forced transformation. It's almost as if those entries warn you about your selfishness in using your Pokémon as battle tools, even though Mega Evolutions require a strong bond between Pokémon and trainer.

* Pokédex entries in the original ''Sun and Moon'' already became notable for their general increase in morbidity, but a lot of the entries in ''Ultra Sun and Ultra Moon'' are ''even worse'' than before. Of particular note are the entries for Mega Evolutions, which go out of their way to emphasize that you either caused your Pokémon to suffer excruciating pain or injuries due to forced transformation or that your beloved companion isn't there anymore because you brainwashed them into becoming what amounts to a barely-sentient weapon of mass destruction. It's been theorized that these Pokédex entries were made so horrifying so that fans would be less upset about Mega Evolution being removed in the next generation.

* Pokédex entries in the original ''Sun and Moon'' already became notable for their general increase in morbidity, but a lot of the entries in ''Ultra Sun and Ultra Moon'' are ''even worse'' than before. Of particular note are the entries for Mega Evolutions, which go out of their way to emphasize that you either caused your Pokémon to suffer excruciating pain or injuries due to forced transformation or that your beloved companion isn't there anymore because you brainwashed them into becoming what amounts to a barely-sentient weapon of mass destruction.

* Grimer and Muk leak "horribly germ-infested fluid". A single drop of Muk's fluid can turn a pool stagnant and rancid. Touching causes a fever and its footsteps leave behind poisoned ground that nothing will grow on for three years. Grimer, while less powerful, is more dangerous indirectly, as it leaks more fluid than Muk, which may eventually become more Grimers. Grimer's germ-infested fluid can kill off all flora (including weeds) and make the land unfit for future plant life, touching it can either cause a horrible flu or fatally poison the victim. Basically, the "facts" imply a rampaging Muk is the Poké-verse equivalent to Chernobyl.
* Gastly. This adorably goofy-looking ghost head is cute, but also over four feet tall. And since it's made of gas, it can "sneak into any place it desires", according to several Pokédex entries, and can "envelop an opponent of any size and cause suffocation" as well.

** If you want an extra layer of horror, the dex entry for ''Moon'' says that inside Palossand, you can find the ''dried-up bones of its past victims''.

** According to a journal entry in the Pokémon Mansion, Mewtwo's creation occurred when a Mew "gave birth" to a Mewtwo during the cloning experiments (which is actually pretty close to [[ShownTheirWork how real cloning works]]). Ask yourself: Was Mewtwo BornAsAnAdult? Could that tiny little Mew [[DeathByChildbirth survive]] [[ChestBurster giving birth to it?]] The Let's Go games on the other hand just has the entries say the people making Mewtwo "obtained a new Pokémon from Mew".

* While Xerneas may seem like the benevolent counterpart to Yveltal, after hearing about the extent of its life-giving abilities, you'll be ''thankful'' that Yveltal's around to help balance it out. Xerneas is capable of sharing everlasting life. As in ''immortality.'' While this may seem like a good thing, keep in mind that ''Pokémon X & Y'' have two characters who became immortal due to the use of the Ultimate Weapon, those being AZ and the Eternal Floette, and up until their reunion, they were both miserable because of it. The former of which [[WhoWantsToLiveForever has been wandering the region for centuries, unable to die]], and the latter [[ImmortalityHurts has already experienced the pain of dying before]]. The worst part? In ''Pokémon X'', as a last-ditch attempt to punish the player for defeating him and crushing his schemes, Lysandre attempts to use the remaining energy in Ultimate Weapon (which had been sapping Xerneas's power) to curse both you and your friends (as well as himself) with immortality. This results in the Team Flare base [[CollapsingLair collapsing in on itself]], trapping Lysander inside — the PlayerCharacter and their friends get out of there before it's too late, but [[AndIMustScream if they hadn't...]]

** According to a journal entry in the Pokémon Mansion, Mewtwo's creation occurred when a Mew "gave birth" to a Mewtwo during the cloning experiments (which is actually pretty close to [[ShownTheirWork how real cloning works]]). Ask yourself: Was Mewtwo BornAsAnAdult? Could that tiny little Mew [[DeathByChildbirth survive]] [[ChestBurster giving birth to it?]]

** The entry for Ultra Moon is also kinda dark. Since it puts things it values in its bubble, there have been cases where Araquanid has put its trainer in its bubble. Imagine how horrifying that is where your Araquanid is trying to put you in its bubble because it loves you and it can potentially kill you by accident.

* Tyrunt and Tyrantrum are Pokémon based off of T-Rex. And they both have violent tempers. Tyrunt may be cute, but it throws tantrums when it does not get its way. And Tyrantrum's bite is so powerful that it lived as a king in its time because nobody could fight him!

* Behold [[https://cdn.bulbagarden.net/upload/f/fc/493Arceus.png Arceus]]. Doesn't look too scary, right? Just a weird-looking Kirin horse-thingy Pokémon, right? Nope. For one thing, its signature move "Judgement" is capable of destroying entire cities and taking out weaker Pokémon with ease. Not only that, but its "Multitype" ability allows it to become any of the 18 elemental types of Pokémon available (meaning it can also learn a wide variety of moves). Oh, but it gets better. You see, Arceus isn't just any run of the mill Legendary. It just happens to be the Pokéverse's version of God. Luckily for us, [[FanNickname "God Pony"]] prefers to nap and not interfere with the Pokéverse directly. That is, [[Anime/PokemonArceusAndTheJewelOfLife unless you piss it off; then it will go so far as to destroy the entire world in its rage.]]