We still have quite a few viable mons left; Specially Defensive Manaphy, Mandibuzz, Conkeldurr, Specially Defensive Amoonguss and maybe Dragalge can all check Gengar. Yes, some of these are more passive but they all have ways to not be easily taken advantage of. Mandi has Whirlwind / Taunt, Amoonguss has Spore, Clear Smog and Foul Play, while Conk, Dragalge and Manaphy still hit decently hard.
As for user RedCat's Chansey, I admit that set is really annoying to face in OU, not just Gengar. However, I have 2 reservations;
(1) picking Chansey means we can't play offense and is reduced to playing Stall or Semi-Stall
(2) Chansey's passiveness causes the opponent to set-up on it. Or they are cornered into choosing a Fighting-type
As for user RedCat's Chansey, I admit that set is really annoying to face in OU, not just Gengar. However, I have 2 reservations;
(1) picking Chansey means we can't play offense and is reduced to playing Stall or Semi-Stall
(2) Chansey's passiveness causes the opponent to set-up on it. Or they are cornered into choosing a Fighting-type
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