Cradily
This guy here...
He will FUCK YOU UP.
He's like a ninja, he just sits there and waits. He watches you, takes everything you throw at him and recovers it right off. Then he'll curse, you know, buff his defense. Maybe ingrain, he can wait. When he's ready he just toxics you, you're in for a long slow death.
But thats not all, oh no. Prehaps he'll give a confuse ray, you ain't hurting him, might as well hurt yourself. Then maybe he'll trip you up, give you the old grass knot. But then when you least expect it he'll sneak up next to you and bury you with a rock slide.
And thats just the males, don't ask about the females.
This guy right here is the master. You will not defeat him, he can take your arceus and your mewtwo and just make them disappear. You know why this guy went extinct? They killed EVERYTHING, then had nothing to eat.
But now he's back, and you're already dead.