How do you get a power crystal in Kingdom Hearts?

Answer 1

you can get power gems from Shaman (monkey heartless) at the pride lands in the wastelands. the shaman riding the living bones heartless wont give them to you though so only the shaman will do. i hope i helped. By the way equip lucky lucky skill and the Sweet memories keyblade to make the items pop up more often. I hope i helped

Answer 2

Power Crystal are found by defeating Morning Stars.

Answer 3

defeat a shadow