Gengar with dark pulse is meant to counter psychic and ghost types, since I don't have much coverage against them. Although I might replace destiny bond. I'm not getting any value out of that.
I'm trying to get my hands on a Gastly (or anything in the evolutionary line) that has hypnosis. Everywhere I look, though, I do not see any with hypnosis, but Bulbapedia states that Gastly knows hypnosis at level one in literally every generation. I am confused?
Here is my reasoning: Grinding.
Grinding on set is really REALLY annoying because you have to spend a tempo to throw out your low level in a trainer battle (or else grind on wilds, which is slow AF). Like, the main reason trainer battles (outside of gym leaders) are in the game is that it is faster grinding them than grinding wilds and removing shift from those trainer battles makes this process much MUCH harder and more drawn out.