When no weather condition is under effect, Weather Ball deals damage of the Template:Type2. During any weather condition, Weather Ball attacks with a different type and its base power doubles to 100. The type that Weather Ball is depends on the weather conditions at the time it is used. It will be:
Template:Breedlist
|-
| style="background: #FFF; font-family:monospace,monospace" | 0069
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Bellsprout
| colspan="1" style="background:#3FA129; text-align: center;" | Grass || style="background:#9141CB" align="center" colspan="1" rowspan="1" | Poison
| style="background: #FFF" | Roserade
|-
| style="background: #FFF; font-family:monospace,monospace" | 0361
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Snorunt
| colspan="2" style="background:#3DCEF3; text-align: center;" | Ice
| style="background: #FFF" | Castform Roserade
|-
| style="background: #FFF; font-family:monospace,monospace" | 0420
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Cherubi
| colspan="2" style="background:#3FA129; text-align: center;" | Grass
| style="background: #FFF" | Castform Roserade
|-
| style="background: #FFF; font-family:monospace,monospace" | 0425
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Drifloon
| colspan="1" style="background:#704170; text-align: center;" | Ghost || style="background:#81B9EF" align="center" colspan="1" rowspan="1" | Flying
| style="background: #FFF" | Castform
|-
| colspan="6" | Bold indicates a Pokémon which gets STAB from this move. Italic indicates a Pokémon whose evolution gets STAB from this move. *Indicates Pokémon that can only learn the move through chain breeding.
|}
|}
Bellsprout is the only Pokémon to learn Weather Ball through breeding that cannot have Castform as a parent.
All Pokémon who can learn Weather Ball are weak to at least one type of Weather Ball. Ho-Oh is weak to Water-type and Rock-type Weather Ball. Roserade, Bellsprout, Snorunt, and Cherubi are weak to Fire-type Weather Ball. Lugia, Roserade, Bellsprout, Cherubi, and Drifloon are weak to Ice-type Weather Ball. A Castform with its ability negated or changed will retain the type it was when its ability was negated or changed, so Sunny Castform will be weak to Water-type or Rock-type Weather Ball and Snow-Cloud Castform will be weak to Fire-type or Rock-type Weather Ball.