Currently there is a bug with pet battles where if your pet is faster than the enemy pet, you can pass your turn or just let it time out and the other pet will have their turn skipped. You can use this with a full team of cockroaches to cast apocalypse and then spam pass so it quickly ticks down and one shots the enemy pet. Or just begin a PVP pet battle and then do something else until the opponent gives up. Good for getting those family brawler pvp achievements.
Edit: Fixed