How can you tell your card is this one?

Look at the bottom of your card: you should read S8b 177 there.

S8b

Hiding [D] Energy S8b 177

Name: Hiding [D] Energy S8b 177
Brand: Pokémon

S8bKO

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Check the number and illustration against the card you are looking for.

How can you tell your card is this one?: Look at the bottom of your card: you should read S8b 177 there.
Which set does it come from?: It comes from the S8b set.

Its characteristics and effects in play, with the original text when available.

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As long as this card is attached to a Pokémon, it provides Darkness Energy. The Darkness Pokémon this card is attached to has no Retreat Cost.