To start, every sun team needs a Setter. Liepard is a great priority sun setter, but it's extremely frail. So I've got Uxie here to be a bulky sun setter, rock setter, and with Memento, you can also memento to give one of your sweepers a turn of setup, which is often needed. Venusaur and Victreebel are both Growth Sweepers with Chlorophyll. Essentially, you're going to want to send it in on something that would be switched out by it's presence, or use Memento to force a switch. After that, you go for Growth and sweep during the limited turns the sun is active. Tyrantrum is here as both a cleaner and a flying resist, since this team doesn't like Fletchinder. Houndoom is here as a fire switch-in because this team doesn't like fire that much either. It's also a secondary sweeper.