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My favorite has been Gengar since I was a kid, and he's generally agreed to be really good in certain play styles and has a pretty boss Mega.
I absolutely cannot reliably battle with him though because I'm terrible and need to learn when/where to use him. Just perfectly EV trained a shiny Jolly one and I'm determined to make up for his lowered SpA by somehow taking advantage of his upped speed, but I'm terrible and have no ideas.