Crobat

Air Cutter?/ Sludge Bomb should be its best moveset. I have a few I mainly use it as a prestiger I caught a high level Zubat that ended up being a 2100 Crobat. It's slightly better than Pidgeot, but nothing you'd want to use unless you've always liked the Pokemon.

The most likely use would be with an Air Slash moveset, probably Air Cutter or Sludge Bomb, against Machamp.