Has anyone tried to use Zubat? They are available early in-game, and are excellent for the 3rd gym, being x4 resistant to bug and grass, while learning Wing Attack right off the bat (pwn intended).
Once it evolves into Crobat, it outspeeds everyone and has access to Acrobatics at Level 33. Also, they are one of the few flying types available throughout the game, and can be used as HM Fly slave.
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