Some notables.
Heliolisk gets an undodgeable Solar Power boosted Thunder. Yikes. Hilarious burn-out rate if you don't give it Safety Goggles, though.
Mamoswine gets nothing but benefits from this meta, being immune to both damaging effects, buffered from its Water and Fire weaknesses, and no longer concerned about Solar Beam. Meanwhile it ignores Thunder, Thick Fat renders it effectively resistant to Blizzard, and almost everything with Hurricane is vulnerable to Ice Shard. (Volcarona is by far the most notable exception, being actually resistant)
Aurorus meanwhile is, strictly speaking, also notably improved, but now its Ability (and its Hidden Ability if that gets released soon) is a dead slot (Just use Blizzard), and Rock/Ice is an awful type combination.
Sheer Force Nidoking got a sizable upgrade, with perfectly accurate Blizzards and Thunders, and it's immune to Sandstorm anyway, not to mention it appreciates being buffered against Water. (It's also neutral to both Fire and Solar Beam, so that's nice too) Nice. There's actually a rather larger number of Pokemon that get both, mind. Boltbeam just got a huge upgrade in general.
Tornadus-Incarnate actually has something over Thundurus-Incarnate in this meta: Hurricane. More likely it will be overshadowed by other Hurricane users, in practice, but even so.
Whimsicott is the only Pokemon in the game that gets a more-speed-in-weather Ability (Chlorophyll) and Hurricane. There are a number of Pokemon with Swift Swim and Blizzard. (Ludicolo, Beartic, Kingdra, Golduck, Gorebyss, Huntail, Floatzel, Omastar, Kabutops, Carracosta, Lumineon, Luvdisc, Mantine, Relicanth, Qwilfish, and Poliwrath) There are no other cases of getting Hurricane, Thunder, or Blizzard alongside doubling their speed in a weather.