In gen 1, Gengar's only STAB move was Lick, and it was a 20BP physical attack
Nidorino can learn Earthquake, and Gengar can't Levitate in Gen 1
It's probably packing shit like Tbolt/Mega Drain/Hypnosis/Dream Eater though, while Nido has EQ/Blizzard/Thunder/Body Slam maybe.
Tl;dr Gengar hits Hypnosis and OHKOs with Dream Eater
Hypnosis misses Nidorino may OHKO with EQ
But the animation looke like Tackle/Body Slam/Horn Attack so Nido trainer is retarded
A real bad matchup is Gengar v Jiggly
