Haunter (Fossil FO 21)

Haunter — 50 HP — [P]
Stage 1 — Evolves from Gastly

Pokémon Power: Transparency
Whenever an attack does anything to Haunter, flip a coin. If heads, prevent all effects of that attack, including damage, done to Haunter. This power stops working while Haunter is Asleep, Confused, or Paralyzed.

[P][C] Nightmare: 10
The Defending Pokémon is now Asleep.

weakness:
resistance: [F]-30
retreat: 0

Illus. Ken Sugimori
Fossil — 21/62 — Rare

Because of its ability to slip through block walls, it is said to be from another dimension.