i think you're making a big mistake leading blace. it's not a wallbreaker or even a sweeper, it's a late game cleaner and nothing more. if you're gonna lead with a wall breaker, lead with kart and fuck some shit up. and against victini, latias is not a check, it's a counter. so if it z's, just go straight to latias and start setting up. fini is impotent against it since stored power 2hko's.