![Mystery Energy (The Best of XY 166/171)](https://static.tcgcollector.com/content/images/c6/c6/1e/c6c61e963bee26d9a88cf5233223eadc5d13441d79576cb10e167c77029bf61f.jpg)
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This card can only be attached to Psychic Pokémon. This card provides Psychic Energy, but only while this card is attached to a Psychic Pokémon. The Retreat Cost of the Pokémon this card is attached to is Colorless Colorless less. (If this card is attached to anything other than a Psychic Pokémon, discard this card.)