Riku Replica/Gameplay

The Riku Replica is fought on several occasions in Chain of Memories and Re:Chain of Memories.

Playing as Sora
When fighting the Riku Replica, you need a few boss cards: Jafar, Oogie Boogie, and Card Soldier just to name a few. You will also need a few Magic Cards, Attack Cards (numbered 7-0) and Item Cards other than Potion. Equip the Jafar boss card and start attacking. When that runs out equip the Card Soldier boss card and use that, then when those run out use magic and other cards but save the Oogie Boogie boss card until you are low on health.

Even if you have a high number of card points, you might still want to consider beating the Riku Replica without boss cards, so try this:
 * Without boss cards

Stock up cards numbered 7-9, an Elixir and a Hi-Potion at least, two or three Stop cards, two or three Cure cards and some 0 cards at the end of the deck (to break the Replica's attacks). You might want to insert some Premium Cards in to save CP (perhaps, the first in the sleight). Or, if you are confident of reloading your entire deck whilst fighting him, then by all means, stock a whole lot of Premium Cards in your deck to make room for more cards.

Don't be shy about using sleights - and using the Lethal Frame sleight (as many times as you can) will let his guard down for a short while, allowing you to think of your next sleight. Keep bashing the Replica with sleights, reload (using an Item Card) and heal when necessary, and you'll be on your way to winning.

If you must use an Enemy Card, and you need to make good sleights, have a Bouncywild card in hand: it only costs 10 CP, and it draws your Goofy and Donald cards together (whilst you keep yourself occupied with the Replica), giving you the chance to perhaps use Trinity Limit.