A new Pokémon, Korechū (Japanese: これュウ and これちゆぅ, sic) was revealed in a magazine page scan. PokéLord later admitted it had composed it as a joke. [1][2][3][4]
Chance (Japanese: チャーンスChānsu), believed to be a pre-evolutionary form of Chansey, is revealed as a new TCG card. (Pokébeach: [5][6])
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, revealing the shadow of a Pokémon named エイプリルフール — a katakana rendition of April Fool. (Legendary Pokémon: [7]).