scizor (or really anything bug type)

I feel like kecleon is underappreciated. It may have terrible stats, but it's ability is unique and lends itself to neat situations in a playthrough. I even made a tcg deck featuring it and kabutops to make kecleon deal 360 damage to anything with a weakness that unfortunately got rotated out of standard.

Ueah Ceruledge is cool! Also Zekrom ⚡️

It's a tie between Sceptile and Pikachu for me. Maybe Sceptile.