>>719965356
The humanoid fighters just make the most sense for Smash considering Smash is a fighting game. You can't have something that floats/flies like Skarmory, Chandelure, or Barraskewda because that just breaks the gameplay of Smash. You don't want something too wide/long like Rapidash, Metagross, or Zacian because then you're just combo-food. They have to have something that could viably work as a recovery option, so that disqualifies another good chunk of Pokemon like Diglett, Tyrantrum, and Krookodile.

The weirdest you can get would be something like Trevenant, Empoleon, Gengar, and maybe Aegislash or Serperior if you're feeling adventurous.