New descriptions: Mew: I chose mew as a lead because it's fairly unpredictable, has stealth rock, counters other leads with taunt/magic coat, and kill 1 pokemon with the normal gem explosion. Taunt and Magic coat may seem redundant but magic coat has a +4 priority which ensures it'll be faster than lead terrakion, aerodactyl, azelf, and infernape.
Ninetales: Ninetales is obviously the mvp of any sun team. I chose the defensive set because It needs to stay alive so I can win the weather war. If it dies without winning the weather war I pretty much lose the game. Sunny day may seem redundant but it's there if a politoed/tryanitar come in and I don't feel like switching.
Dugtrio: Dugtrio is a very effective trapper and revenge killer and is here for opposing weather changers like politoed and tyranitar. It can also kill stuff like jirachi and tentacruel with earthquake; Volcarona and flying types with stone edge. I chose memento for the last slot because I feel stealth rock isn't needed with mew and .5 atk and sp atk is just awesome.
Venusaur: Under the sun venusaur will pretty much always go first and pull off a successful sleep powder then proceed to use growth to sweep the entire enemy team. If the opponent switches I would just do another sleep powder. Giga drain is an obvious stab and hp fire is for steel types and is boosted by the sun. The Ivs minimize foul play/confusion damage and still pull off the hp fire.
Victini: He is so strong with vcreate these are some damage calcs to very bulky pokemon and pokemon that resist it (this is without the sun)
V-create vs. 252/244+ Hippowdon: 62.14% - 73.09%
V-create vs. 252/0 Gastrodon: 64.78% - 76.29%
V-create vs. 0/0 Salamence: 73.11% - 86.1%
V-create vs. 0/0 Garchomp: 58.82% - 69.46%
V-create vs. 248/216+ Jellicent: 46.65% - 55.08%
V-create vs. 0/0 Keldeo: 68.11% - 80.18%
V-create vs. 0/0 Rotom-W: 78.51% - 92.56%
Heatran: Tbh Heatran is pretty much just a placeholder on this team because I can't find any pokemon to replace it. With that being said his typing allows him to switch into a lot of moves and his movepool allows him to have some great coverage. With air balloon he could even switch into the dreaded earthquake.