Toxic Orb + Fling isn't a good strategy, but I don't know enough about NatDex to tell you what to replace it with. You could consider Rapid Spin over Trop Kick, as you don't need both that and Power Whip. Draining Kiss is also a pretty terrible move on Tsareena.
I don't see what Protect accomplishes on Slowking, try Teleport instead to pivot and keep momentum.
Rocky Helmet isn't a good item on Salazzle, try Focus Sash or Heavy-Duty Boots instead. Sludge Wave is better than Venoshock, and Fire Blast is usually preferred over Flamethrower.
I think Cursola is completely unviable, especially with that set. Focus Sash isn't a good idea, especially not with Ghost Curse. Curse isn't actually good at all on Ghost types, and you don't need Night Shade when you have Shadow Ball. You could try something like Shadow Ball / Earth Power / Strength Sap / Ice Beam, but I think other Ghost types (like Aegislash and Gengar) are completely better than Cursola.
Raichu-Alola doesn't have a good set at all. It's to frail to be setting up its own Terrain, and Discharge is redundant with Thunderbolt. Seismic Toss is especially terrible on it, and you really should be using Psychic STAB, Grass Knot, and Focus Blast (though Raichu-Alola is probably outclassed as a whole without Terrain support).
