How did Pokemon Weather Boy evolve?

Can't evolve, the weather boy uses weather skills to change attributes and shapes in combat, and also makes the weather ball skills change attributes.

Cleaning-solar form-fire system

Begging for rain drop form-water system

Hail-rain cloud formation-ice system

-Normal form.-Normal type

Note: the weather boy's attributes and morphological changes can only be used in combat, and the changes disappear after the battle.