Unown M - 66/123 - Uncommon - Reverse Holo from Diamond & Pearl: Mysterious Treasures, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Reverse Holo
• Artist: Kazuyuki Kano
• Card Text:
  Poké-POWER — MAGNET
  Once during your turn (before your attack), if Unown M is your Active Pokémon, you may flip a coin. If heads, switch 1 of your opponent's Benched Pokémon with 1 of the Defending Pokémon. This power can't be used if Unown M is affected by a Special Condition.
  [1] Hidden Power
  Flip a coin. If heads, this attack does 30 damage. If tails, this attack does 30 damage to 1 of your Pokémon, and this attack's damage isn't affected by Weakness or Resistance.