Mo-Nercy³, your info is coorect and to figth Anima you have to do the Wakka-trow-blitzball-into-some-strange-thing mini game. Then the Dark Anima will appear where all the Ronsos is. However, if you can't beat the Dark Aeons without the cheap Zanmato, then you will never beat Penance without it sice all the Dark Aeons is pice of cake compared to Penance.