Anybody else think it'd have been fun to capture the ghost Marowak in Lavender Town's Pokémon Tower? Personally, I feel it'd have been a novel concept to make that one a unique capture - imagine having a Ground/Ghost-Type Marowak at your disposal. STAB on any Ghost moves you put on it, can't be hit by Normal attacks, just to name a couple fun conceptual perks.

While on the subject, if Marowak's not your cup of tea, what Pokémon would you have liked to see as the haunting presence of the tower? Scyther? Rapidash? Bellsprout? Magikarp? (I'm going to hell for that one...)