They Could...
Valefor-Fly away
Ifrit-Give the others rabies
Ixion-Run around impaling things
Shiva-Turn invisible and sneak up on someone and slit their throat
Bahamut-Mega Flare
Yojimbo-(God I hate him)All the aeons would gain up on him first.Besides,he's an aeon,why does he need gil?
Anima-Just unleash her bottom half...(that sounded kinda gross)
Magus Sisters-Just have the fat one body slam the other aeons