>>33124468Because as the generations went on, Gengar was one of the mons that just happened to benefit from the game mechanics changing no matter what in addition to having an ever expanding movepool:
In gen 1, it was literally untouchable because it was the ONLY ghost in the game giving it a huge advantage defensely.
In gen 2 gave it powerful and reliable STAB moves in shadow ball.
Gen 3 introduced natures which let it min-max its sp.atk and speed to their fullest with proper EV training and abilities, which gave Gengar levitate giving it complete immunity to one of its weaknesses.
Gen 4 saw the physical/special split which let it use its sp.atk stat and STAB moves to their fullest extent.
Gen 5 saw an improved disable, letting it viably run sub-disable sets
Gen 6 let it see more offensive presence in the face of fairy typing, giving its poison moves more worth in addition to an almost broken mega evolution while also giving it a new fairy move to use in its own right.
And gen 7 not only compounded its fairy killing moves by having even more fairies to fuck around with, but cursed body gives it the potential to be a massive dick to other players. Also, 100% focus blast is nice with a Z-move.
