In Kingdom Hearts Chain of Memories, the battle takes a entirely new turn focusing on cards which in turn creates CoM to be more of a tactics game as well, to use the cards and use each card to the fullest effect.

1 . Use a balencened deck Make Sure that you use a deck that has a 7-3 ratio of Attack cards to Magic cards and of the magic cards have at least 3 curative cards.
2 . Take Advantage of Zero Cards Have a good number of power zero cards so that you can negate the enemy's cards.
3 . When Enemy's Deck is gone When the enemy's deck of cards runs out, either heal or attack the enemy!
4 . Limit the Use Of Sleights Sleights are effective but, you lose one card each time you use a sleight so be careful.

Using these strategies and other strategies you can be successful in any KH CoM battle, and more.