Metal Core Barrier (Crown rarity) is the #B2b-117 card from the Mega Shine set in Pokémon TCG Pocket. Metal Core Barrier can be obtained from Mega Shine Booster Pack in the Mega Shine Set.
“If this card is attached to 1 of your Pokémon, discard it at the end of your opponent's turn. The [M] Pokémon this card is attached to takes −50 damage from attacks from your opponent's Pokémon.”
PocketCards.net
