Any damage done to Bidoof by attacks from Pokémon is reduced by 20 (after applying Weakness and Resistance).
This card was released in the Mysterious Treasures expansion, first released in the Japanese Secret of the Lakes expansion. A promotional version of this card was one of 24 released in the Pokémon Countdown Calendar in October 2008. This version features a gold foil snowflake stamp in the bottom right corner of the artwork.
Bidoof using a Wacan Berry's effect doesn't match how Wacan Berry works in the video games, since its effect in the games is to lower the effectiveness of a super-effective Electric-type move. Bidoof is not weak against Electric-type moves (although its evolved form is).