During a robattle, get to a place where the opponent can't hit you. Then wait for a while and then a blue circle will appear and the medaforce will charge faster.(If you move or get hit by the opponent, the medaforce will stop charging fast)
A good strategy is to get the bear medal (rokusho version only) and wait for the medaforce to charge up. When it is charged, use the medaforce and go ballistic on the enemy with a fast grappling weapon, eg; Rokusho's Sword. Each hit will bring them to at least red and 2 hits will kill them. I find that this is a good way to win battles fast.
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