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When you really think about it, Greninja is probably the only moderately recognizable Kalos mon for a lot of voters and also at the top of the list, so it probably got a shit ton of votes just because of that.
Charizard competed with a bunch of other wildly popular gen 1 shit and still powergapped, I bet if it was a "top 5 of each" vote most of the soretards/pikatards would have voted for it too and dilated the frog handily.