As this crab only appears in the story mode of the Japanese exclusive physical release of Bomberman Blast, simply known as "Bomberman", it does not appear in the WiiWare release of the game.
For Bomberman’s return to the Game Boy four years after Atomic Punk, things get strange in more ways than one. Known as Bomberman GB in Japan (the GB stands for “Great Battle” and “Game Boy” according to Director/Game Designer/Graphic Designer Norio Okubo), this entry completely changes the single player formula into something that more closely resembles the multiplayer mode and forgoes all previous story elements for a uniquely small scale scenario. And yet, that isn’t the strangest thing about Bomberman GB; when it was brought over to North America and Europe, it was renamed Wario Blast: Featuring Bomberman! and had Nintendo’s then-new villain shove Bomberman out of the leading role. The reason behind this crossover has never been explicitly revealed, but it’s reasonably likely to have been for marketing purposes, an idea that sounds like it worked considering the game was cited as the one of the “Top Game Boy Games of 1994” (#4 to be exact) in issue 68 of Nintendo Power. Norio Okubo has spoken about the game on Twitter, stating that Wario was chosen over Mario because blowing things up with bombs seemed out of character for Nintendo’s leading man. Despite being a new character with less than perfect morals, Nintendo still had very strict, Disney-esque rules for what Hudson Soft could and couldn’t do with the character. Even with all the effort it took to implement Wario, his presence doesn’t change much about the English versions, only resulting in some different visuals should you choose to play as him.
Here's the announcement trailer for Super Bomberman R on PC (Steam), PS4, and Xbox One. Released around June 2018 worldwide. The game is also available on Nintendo Switch.