???

??? is a type re-introduced in Generation Omega from Generations 2 through 4. It retains all of its properties from back then (Curse becomes ???-type (???-type users gain two stages of Speed with it instead of losing them), though ??? is neutral against and to all types, but it now has some offensive moves and Pokémon. All past glitch types are reclassified to ???).

???-type moves: Curse, Tesseract, Virtual Vision, Question Cannon, Aeternoblade, Permeate (counter).

???-type Pokémon: Hmmeon, Primal Mew, 'M, Missingno., Bad Egg (genetically enhanced), 3TrainerPoké, ? (glitch Pokémon, reclassified to Normal/???), Decamark (reclassified to Normal/???).