where do i get enough of them to customise my weapon for auto-phoenix if anone knows let me know it would be appreciated.
Bribe the Ghost for ~200,000 Gil for about 35 Mega Pheonix. You could also try giving the 200,000 to an Alcyone to see how many it gives. The Alcyone gives 2 for 8600 so it may be better.
I swear you can steal them from the mechanical things (or else they drop them as a rare item)
i can't quite remember, but i do know that I could get them without bribing
Mega phoenix? adoi..... monster arena loh, i remember getting 99 mega phoenixes after i've unlocked a monster in the arena....erm.... species or area conquest....