Rate my first OU team please

Question

I have only done a few pokemon showdown battles with them but gengar and venusaur are pretty good:
Gengar @ Wide Lens
Ability: Levitate
EVs: 252 SAtk / 4 SDef / 252 Spd
Modest Nature
- Hypnosis
- Dream Eater
- Shadow Ball
- Hex

Venusaur @ Heat Rock
Ability: Chlorophyll
EVs: 252 HP / 4 SAtk / 252 SDef
Modest Nature
- Solar Beam
- Toxic
- Synthesis
- Sunny Day

Tentacruel @ Leftovers
Ability: Liquid Ooze
EVs: 252 HP / 252 SDef / 4 Spd
Calm Nature
- Ice Beam
- Hydro Pump
- Sludge Wave
- Aqua Ring

Metagross @ Leftovers
Ability: Clear Body
Shiny: Yes
EVs: 252 HP / 252 Atk / 4 SDef
Adamant Nature
- Meteor Mash
- Zen Headbutt
- Stealth Rock
- Earthquake

Garchomp @ Lum Berry
Ability: Rough Skin
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature
- Outrage
- Fire Fang
- Earthquake
- Stone Edge

Ninetales @ Leftovers
Ability: Drought
Shiny: Yes
EVs: 4 HP / 252 SAtk / 252 Spd
Modest Nature
- Flamethrower
- SolarBeam
- Will-O-Wisp
- Calm Mind

Comments

Nice team but remove ninetales' will-o-wisp. It seems your ninetales is all out attack and flamethrower already has a 10% chance to burn. Although, 10% is kind of rare.

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And I noticed you don't have any mega pokemon

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+Blade with Leaves You don't have to have a Mega on a team, plenty of teams do fine without them.