Meowth has been I love with I dunno many girl pokemon. But- in one episode Meowth falls in love with a trouble making Purrlion, but so does Oshawatt (Meowth was traveling with the 'twerps'). But Purrlion was, I'm not kidding, a guy.
"So please baby, don't say no. Go out with me!" says Meowth. "Osha! Oshawatt!" Oshawatt begs. "Ugh, guys. You see, purrlion's a... guy." says the trainer.