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The shillmon of Pokemon, like Charizard, Lucario, and Greninja, all share several things in common. Here's a list.
>featured heavily in the anime
>obtainable relatively easily in the games
>popular among the fanbase
>top-tier in competitive
So, who's a Pokemon in Gen 7 that's featured prominently both in the anime and games, is highly popular, AND is top tier? I'll give you a hint. It's neither Decidueye or Incineroar.
Of course, it won't matter anyways, since no Pokemon from an odd-numbered generation that isn't Gen 1 has ever gotten into Smash.