Pukupuku (Wario Blast: Featuring Bomberman!)
From the Super Mario Wiki
Pukupuku (プクプク) is the Round 6 boss of Wario Blast: Featuring Bomberman!, formed out of the three Madbombers. It attacks by shooting gem-like beams when Bomberman or Wario are directing near Pukupuku. In order to defeat it, Bomberman or Wario must lay bombs down and have Pukupuku close to the blast. After each two hits, Pukupuku's bump begins to grow, and will eventually deflate, accompanied by a bomb explosion Bomberman or Wario must watch out for. In this deflated state, Pukupuku can be damaged and cannot hurt Bomberman or Wario. Once Pukupuku is defeated, the protagonist can move on to the next stage.