Okay Yami, just Focus Blast Ursaring into oblivion, and if it's down use Night Daze on Luxray. If your health gets below 10, use U-Turn instead of whatever I've said. Yurei, Flamethrower on Ursaring to help Yami out (switch to Luxray if it goes down), and if he U-Turns put whoever's left to sleep with Hypnosis.