It evolves when bathed in an electric-like energy along with Karrablast. The reason is still unknown.
Type
Attributes
Expansion
Number
Rarity
Release
Regulation
Formats
Energy Types
Species
HP
Retreat
Weakness
Resistance
Stage
Evolves From
Artist
If Karrablast is in play, search your deck for a card that evolves from this Pokémon and put it onto this Pokémon. (This counts as evolving this Pokémon.) Shuffle your deck afterward.