Oliver & Spike has not been officially confirmed for Wii U. In April, developer Rock Pocket Games said that the game’s release on Nintendo’s console would depend on a “potential partner”.
Not much has changed since then, as Oliver & Spike’s fate on Wii U hasn’t been determined. However, according to Rock Pocket’s Natascha Röösli, the game is now being pitched to the likes of Nintendo, Sony, and Microsoft as a second-party title.
Röösli told Dromble:

Not only will the upcoming Pokémon X/Y have the largest swath of pokémon to catch in series history, but each one of those pokémon will have multiple “version”, one for each language that the game is available in. Players’ Pokédex will keep track of these entries, so when you trade an American Pikachu for a Japanese Pikachu, your ‘dex will allow you to view both the English and the Japanese versions of the pokémon’s Pokédex entry.
What does this mean for completionists? Well, Game Freak has effectively more-than-tripled the amount of work you’ll need to do in order to get a full Pokédex, which is both a little bit evil and a little bit funny.
