Wondertomb is an iconic part of Gen 4. It kept Spiritomb's relevance, on top of being a potent Pokémon with no weaknesses. It fell apart in Gen 5 when Prankster Sableye made the actual Spiritomb the worse Dark/Ghost, and was completely irrelevant by the time Gen 6 introduced Fairy Type and trivialised the means of getting a Spiritomb