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All of you are wrong.
The correct answer is one of the most forgotten (for good reason) and useless pokemon (regardless of speed Stat), Luvdisc.
It doesn't evolve into Alomamola, which it clearly should, it's worthless in competitive, esp as a rain sweeper, and it's only for completing your dex.
It's a waste of everything, esp a slot that could've been used by a different pokemon design. This should be the most universally hated pokemon here, if it wasn't for being also so forgettable.