From Bulbapedia, the community-driven Pokémon encyclopedia.
Defender (Japanese: ディフェンダー Defender) is a Trainer. It is part of the Base Set.
| Attach Defender to 1 of your Pokémon. At the end of your opponent's next turn, discard Defender. Damage done to that Pokémon by attacks is reduced by 20 (after applying Weakness and Resistance).
Defender is the Japanese name of X Defend, an item in the Pokémon games. The Japanese name of the item was used for the English card by mistake.