Most problematic teams for a drizzle team other than the obvious other weather team was to run Gellicent, i hated those, immune to pretty much everything, Uhm, Grass types/Water Absorb pokemon Toxicroak? i use one in my team with black sludge and dry skin, get massive hp
Uhm Jolteon Sub/Wish/toxic/Thunder
Durant (only weak to fire, has Bug Stab (for grass types)
Maybe Elektross, immune to Ground types (only weakness) stab Thunder, Poison for coverage (for grass types) Dragon Claw for unresisted attack,
run your own Kingdra, Stab Dragon attacks, Swift Swim/HydroPump(Surf)/Dragon Pulse/Ice Beam/Yawn(?). They'll wish they never had rain dance.
I don't know, haven't been battling much since summer classes started, sorry if i wasn't much help man