Densetsu no Stafy

From SmashWiki, the Super Smash Bros. wiki

Densetsu no Stafy (伝説のスタフィー, Densetsu no Sutafī, lit. "Legendary Stafy") is a Game Boy Advance game involving Stafy as the hero.

In Super Smash Bros. Brawl, Stafy is an Assist Trophy, and one of the few Assist Trophies that can be attacked back. He and his sister, Stapy, appear as both trophies and stickers, along with several other characters from the game.