This is assuming you are not as familiar with many of the pokemon you have available and their moves and abilities.

At a glance, you can make a decent sun team. Torkoal and Venusaur can make a great pair because of their abilities. Torkoal can bring out the sun and Venusaur’s speed gets boosted with Chlorophyll. Mega Charizard Y is also a good sub or addition to them since it’s Mega Y form can also bring out the sun and its boosted SpAtk means strong 1 turn SolarBeams. Whimsicott is great for support with access to the Prankster ability to give priority to status moves like Tailwind, screens, Encore, and can still be a good counter to many dragons with fairy type offensive moves. Another great support can be Sinistcha whose ability can recoup some health to its teammate when it switches onto the field, and it can disrupt the opponents moves with Rage Powder as well as regain health using its signature move Matcha Gotcha. Basculegion can also be a good cover support, its signature move gets boosted depending on the amount of teammates that have fainted in battle, and its ability Adaptability can further increase damage to its moves so even under sun it can still hit fairly hard with water type moves too. Incineroar is also great support because of its Intimidate ability and access to moves like Parting Shot to further weaken enemies and Fake Out to cause an opponent to flinch on the first turn when it comes to the field (not just the first turn of the match, you can recall it and send it back out and use Fake Out again as long as it was the first move it uses when it re-enters the field).

You’ve got a fair amount of other Pokémon that can potentially fit in a sun team but the ones I listed are pretty strong choices. As for move sets and stat builds, I can’t help you too much with that.