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Haven't tested all of these, but...
Dance of Death, Chain Sweep, Bachram Explosion(?), Shooting Rush, Sakura Abyss (IF you can load it), Crash Shot, Heat Buster, Act 6: Crisis followed by Act: 2 Threshold Cutter/Act 4: Rising Action, maybe even try charging Thunder 5 times and let it loose on a large group.
EDIT: Oh yeah, there's also Hydra Transmutation.
Don't you have to have the pillow equipped to get feathers? If that's the case, a bunch of those skills would be useless.
Edit: yep you do, DoD and windmill best, everything else useless.