How do you get Mieu Wing in Tales of the Abyss?

I belive it's an attack that Mieu learns, not sure when though. **On your second time through Tataroo Valley, when you first venture across the log bridge to the new area, watch for a large boulder against the north side in the area; use your mieu smash to open the area, inside you'll find a fonon cluster to get Mieu Wing.