Weather conditions in a dungeon may occur. Weather conditions may be set to a certain dungeon floor or can be activated by a Pokémon's moves or abilities. Weather affects all Pokémon on the floor. Weather conditions have been added to the Mystery Dungeon series not present in other Pokémon games.
All moves except Normal type moves deal 3/4 damage.
Electric type moves deal 1/2 damage.
Damages all Pokémon on the floor except Ice-type Pokémon every 10 turns.
Ice-type Pokémon have their speed raised by 1.
Fire-type moves deal 1.5 times damage, while Water-type moves deal 1/2. The move Solar Beam can be used without charging a turn when it is Sunny.