Stage a rescue.

"I know!" Bowser shouted as he was struck with a sudden insight. "Why do you think Peach likes Mario so much?"

"I would say, probably because he's a hero and rescues her all the time," Kammy replied.

"Exactly!" Bowser exclaimed. "So I just have to do the same thing!"

"Umm... but WHO are you going to rescue her from?" Kammy asked, perplexed. "It's usually you that kidnaps her."

"We will just need to get someone else to kidnap her!" Bowser shouted with excitement as he formulated his plan. "I want you to contact Wario. He'll do anything to get at Mario. Tell him we will help him capture Princess Peach! We'll take out the outer guards - as long as we don't engage with her personal guards, she'll never know we had anything to do with it. Then I just have to go and rescue her from Wario!"