Onix

While several Chlorophyll sweepers can fit Sunny Day on their moveset and set it up with ease, some such as Weepinbell have difficulty doing so because of their frailty. Fortunately, there is Onix, which can utilize its decent base 70 Speed to reliably set up Sunny Day and use Explosion to conserve precious sun turns. Onix also possesses key resistances to Flying, Fire, and Poison, which makes it a great teammate for Chlorophyll users such as Bellossom and Tangela, which are predominantly Grass-type. However, using Onix has several downsides, such as the fact that it's fairly one-dimensional. Onix's Special Defense stat is also absolutely abysmal, leaving it susceptible to common special attackers such as Huntail and Chimecho. Lastly, Onix isn't that great because it only fulfills its niche on full sun teams, an archetype that isn't necessarily viable in NU.