From what I heard they usually came in Theme Decks, Zap if I recall correctly. I’m not aware of any copies found in booster packs. It’s probably more rare than you think.
Some more info:
Ghost Pikachu Confirmed
From what I heard they usually came in Theme Decks, Zap if I recall correctly. I’m not aware of any copies found in booster packs. It’s probably more rare than you think.
Some more info:
Ghost Pikachu Confirmed