Rate my Gen 8 OU Sun Team

Question

I really don't know how to make weather teams, so i expect a lot of mistakes.

Torkoal @ Heat Rock
Ability: Drought
EVs: 252 HP / 2 Atk / 252 Def / 2 SpD
Relaxed Nature
IVs: 0 Atk
- Lava Plume
- Stealth Rock
- Rapid Spin
- Toxic

Charizard @ Heavy-Duty Boots
Ability: Solar Power
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Weather Ball
- Defog
- Air Slash
- Solar Beam

Venusaur @ Leftovers
Ability: Chlorophyll
EVs: 252 Def / 252 SpA / 4 Spe
Modest Nature
IVs: 0 Atk
- Giga Drain
- Solar Beam
- Toxic
- Sludge Bomb

Volcarona @ Heavy-Duty Boots
Ability: Flame Body
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
IVs: 0 Atk
- Fiery Dance
- Bug Buzz
- Quiver Dance
- Solar Beam

Arcanine @ Life Orb
Ability: Intimidate
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Extreme Speed
- Wild Charge
- Fire Fang
- Morning Sun

Whimsicott @ Leftovers
Ability: Chlorophyll
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
- Solar Beam
- U-turn
- Moonblast
- Leech Seed

Comments

Torkoal’s last four EVs are put to waste because one stat is added every four EVs. Just put them in Special Defense. Charizard has a pretty awkward set that should probably have something like Fire move (Weather Ball / Flamethrower / Fire Blast) + Scorching Sands (for Heatran and Toxapex) / Roost + Focus Blast (for Tyranitar) / Roost + Overheat. You don’t really need Defog as Torkoal has Rapid Spin. Venusaur should be 252 SpA / 252 Spe. Don’t use two grass moves. Growth + Giga Drain + choose two from Earth Power, Sludge Bomb, Weather Ball. It should hold a Life Orb for extra Damadge output. Arcanine should probably be replaced by Victini. Just look at Smogon’s set. Whimsicott is also not very good.

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I replaced Whimsicott with Heatran, is this good?