In a Medicham deck, you usually need the bench space to power up Medichams and backup attackers, and that takes about 3-4 spots minimum. If Medicham wasn't so frail, I think this could work...
Actually, at the rate the Medichams get KOed, that should give you some space to play down the bats...but you should always have 3 Meditite/Medicham in play.
Now, for these to be effective, you need at least 5-6 spots. Medicham doesn't have that space...so I think you should stick to the Muscle Band/Silver Bangle.