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Never really did any gen II battling.
Off the top of my head, it was basically Rest + Curse + Sleep talk + lefties on everything. Toxic was still kinda shit, which made lefties really good. HP Ghost and fighting were actually viable. Skarm was basically rest, toxic, spikes and drill peck for the most part (and everyone used that fucking bird). You could remove one for spikes and whirlwind. Houndoom was actually useful thanks to dark being special. Battles lasted forever as well, which was the same problem with gen 1.
It wasn't great.