Bowser heard of Vibe Island and wanted to build his summer villa, reasoned that it contains great power. Some of his minions discovered the Vibe Scepter, which Bowser plots his revenge on Mario and Luigi; so he told his minions to go to Peach's Castle and kidnap the Mario Bros. and the Toads.
Later, after Peach and Perry arrived at his villa and discovered Bowser. Bowser had used his Scepter to make Army Hammer Bro rage to guard his way. Bowser mentioned to Peach that it was impressive that she managed to find Bowser. After Bowser had been defeaten, he grew big and told Peach that she has much to learn. After Bowser was defeated with the Bob-ombs, Princess Peach whacked Bowser so hard that Bowser dropped his Scepter in mid-air and the words said "NICE SHOT!".
his battle start