This move effect may be in need of research. Reason:Damage category in shadowy aura You can discuss this on the talk page.
When the weather is clear, Weather Ball is a Normal-type move. During any type of weather, Weather Ball's power doubles to 100 (type power-ups from the weather will be put into effect in addition to this boost).
Weather Ball's type changes depending on the weather at the time it is used.
Pokémon with Bulletproof are immune to Weather Ball, regardless of the weather.
Weather Ball can also be used as part of a Pokémon Contest combination, giving the user four extra appeal points if a weather summoning move was used in the prior turn. It is also part of a Contest Spectacular combination, giving the user three extra appeal points if a weather summoning move was used in the prior turn.
When used as a Z-Move, Weather Ball will be turned into Breakneck Blitz, but then Breakneck Blitz will turn into the Z-Move of the type corresponding to the type Weather Ball would be in that weather. This does not occur if Weather Ball is turned into a Z-Move via another move like Sleep Talk.