An advertisement in the newly-released May issue of CoroCoro in Japan has revealed that the next installment of Generation IV - apparently the third game to to Pokémon Diamond and Pearl - will be announced in the magazine's June issue, which will go on sale May 15. The advertisement features a text list of each set of Pokémon RPGs with their respective revised versions (Pokémon Blue, Crystal and Emerald) written in handwriting as afterthoughts. A hand at the bottom of the page waits to write a new name after Diamond and Pearl with a note that the announcement will be made in the next issue.
Other advertisements for upcoming toys from the 11th movie, Giratina and the Sky's Bouquet: Shaymin, include several place marks for toys featuring two as-of-yet unrevealed Pokémon, codenamed Pokémon A and Pokémon B.
Some have guessed that instead of brand-new Pokémon, the mystery Pokémon in the toy advertisements may be alternate forms for Shaymin and another pre-existing Pokémon (like Dialga or Regigigas) similar to Giratina's Origin Forme. Either way, nothing official has been announced regarding specifics of any new Pokémon.
