Generation Ix
Tera Shift
When the Pokémon enters a battle, it absorbs the energy around itself and transforms into its Terastal Form.
Detailed Effect
When the Pokémon enters a battle, it absorbs the energy around itself and transforms into its Terastal Form.
Pokémon With Tera Shift
1 canonical Pokémon form can have this Ability.
Terapagos 