Just came in here to say that Water Veil + Defog is illegal on Mantine and Lumineon, which really sucks to be honest. I guess they can kiss their niche goodbye.
Speaking of Defog, Swellow can use it pretty well, and I would always slash it on any Swellow set. Being a really fast Defogger can help sometimes, especially if you have Charizard or something. It's already one of the fastest Pokemon in the meta, so quick Rocks removal is neat.
Also, RestTalk physical attackers are probably viable too. Groudon seems like a good choice for something like that, with Precipice Blades and Stone Edge, for example. Or something like Snorlax works too, as you will always be taking passive damage, letting you always have a chance to Rest and hit with your full Attack stat. Really, any Pokemon that are bulky and strong can use this.