If any weather effect (including Trick Room, Gravity, and Uproar, but excluding rain) is in effect and a player of Platinum, HeartGold or SoulSilver uses Pursuit on a Pokémon that is switching out on that turn and causes it to faint, this glitch will activate. Upon sending out the next Pokémon, the weather will have changed, and all four weather conditions will be going on at once until the end of the battle.