421 Cherrim(Sunshine)

Bullet Seed is generally recommended for its high energy generation, giving Cherrim access to its charge moves much sooner. Razor Leaf can be chosen for its powerful STAB damage, but consequently gives up energy generation. 

Weather Ball is the primary distinction between Cherrim and other Grass-types, costing the least amount of energy possible while giving Cherrim easy access to Fire-type coverage. Dazzling Gleam can be elected for its Fairy-type coverage, though it demands a lot of energy to use. Solar Beam costs the most amount of energy, and also threatens potential KOs if unshielded. 

The Sunny variant of Cherrim is significantly better than its Overcast Form, primarily thanks to the addition of Weather Ball (FIre) from the April 2020 rebalance. Fast access to Fire-type coverage lets Cherrim stand out among other Grass-types, and the combination of high energy gains and low charge move costs gives Cherrim strong shield pressure capabilities. The potential threat of a Solar Beam KO is always in the back of the opponent's mind, making Cherrim great for bait-and-nuke plays, but consequently also resulting in inconsistencies when dealing with Water Pokemon due to the reliance on Solar Beam. 

Cherrim has a max CP of 2048, which is lackluster for Ultra League. 

Interestingly Cherrim's access to Grass-type coverage gives it some play even in Master League, due to the frequent usage of Kyogre, Groudon, Rhyperior, and Swampert, all of which are weak to Grass. However, this is the only niche Cherrim has going for it, and is also reliant on successful baits and unshielded Solar Beams.