A new Pokémon, Korechū (Japanese: これュウ and これちゆぅ, sic) was revealed in a magazine page scan also depicting a DS port of Hey You, Pikachu!. PokéLord later admitted he had composed it as a joke.[1] The Pokémon Shinx appears to look similar to this Pokémon.
Chance (Japanese: チャーンスChānsu), believed to be a pre-evolutionary form of Chansey, is revealed as a new TCG card.[2][3] Its only attack is "April Fool".
Pokemopolis posted a cease and desist letter from a law firm representing Nintendo that claimed the site had tarnished Nintendo's image.
Serebii.net forums had an elaborate custom avatar prank which angered many.
Legendary Pokémon showed a fake magazine page scan (actually about The Legend of Zelda), revealing the shadow of a Pokémon named エイプリルフール — a katakana rendition of April Fool.
A fairly predictable joke that recurs each April Fools' Day is an aesthetic change:
Bulbagarden forums forced all users to adopt a skin for a day, parodying the scheme of Serebii.net forums.
Bulbapedia was taken over by a cabal, and various texts were changed to reflect this.
Serebii.net used the classic Digimon-for-Pokémon substitution.
Pokedex.jp also changed its appearance to focus on Digimon.
Serebii.net
Content changes
Haruka Fanclub
A variation on the previous theme, some sites change their focus:
Haruka Fanclub turned into a crudely done Misty fan site for the day.
Dogasu's Backpack changed into "Mod Soul" Kon's Backpack, a Bleach site.
Dogasu's Backpack
Non-hoaxes
Real announcements misinterpreted as hoaxes included:
Pokémon Casewraps[4] - customize your consoles with Pokémon images, but as the information was released on April 1, there was confusion as to whether it was real.