Generation Ix
Zero To Hero
The Pokémon transforms into its Hero Form when it switches out.
Detailed Effect
The Pokémon transforms into its Hero Form when it switches out.
Pokémon With Zero To Hero
2 canonical Pokémon forms can have this Ability.
Generation Ix
The Pokémon transforms into its Hero Form when it switches out.
The Pokémon transforms into its Hero Form when it switches out.
2 canonical Pokémon forms can have this Ability.
Palafin Zero 
Palafin Hero