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For me, completing everything in Critical is a better challenge than Proud. As for AOE, It is best to read his attack patterns, keep dodging and attack wisely (best with Ultimate Shotlock). As for No Heart (despite being the ultimate pain in the neck), I managed to kill him 2 times with Terra, only one successful fight for Ventus and Aqua.You think Proud is a problem.
Come back here when you try to do it on Critical, then we'll talk.