Saisei was blasted, but thanks to the active Light Screen, the Mega Mewtwo Y only suffered minor damage.  "[i]Thank you for cooling me down, Zenni,[/i]" the Mega Mewtwo Y quipped.
"Saisei, Laser Focus while Zenni is recharging and follow it up with Psychic!"  While Zenni was immobile, Saisei concentrated his aim at the Blastoise's weak spot with laser-like precision.  After a while, Saisei's eyes glowed a bright turquoise as it unleashed its psychic power.