To beat Larxene 2nd Time, you need to have 3 Cure cards, 15 Attack Cards: Levels 5, 6, 7, 8, 9 dealing with no Thunder Element, 3 Fire and Blizzard cards, 5 0 level cards,Level 60, Heartless cards: Riku, Green Requiem, Search Ghost, and also Oogie Boogie. BUT NO PREMIUM CARDS!
Use Riku and do some sleights, but not frequently, (Which means that don't use all 5 sleights of Sleight Lock), than attack her normally, but becarful of her Thunder Bolts, try to Dodge Roll them or use zero cards on her, and Teleport Rush, use the zero cards for that, and NO USING THE 0 CARDS FOR SLEIGHTS, NO MATTER WHAT!