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OP. You did the right thing.
The Lopunny seems to have a longing for a compatible mate. It sounds like Lopunny was the only pokemon you had. If pokemon become isolated from others, they may start to develop feelings for the closest thing.
The Lopunny was trying to have sexual intercourse with you which is illegal in some regions and can be bad for your health. Some side effects include: Being called a weirdo furry animal fucker. And that's it. Don't fuck your pokemon. If it were up to me I would have had that bitch spaded before she even evolved.