Rate my Gen 7 OU team! (You can suggest anything if you want)

Question

Garchomp (M) @ Rocky Helmet
Ability: Rough Skin
EVs: 252 HP / 4 Def / 252 Spe
Jolly Nature
- Stealth Rock
- Earthquake
- Fire Blast
- Toxic

Toxapex (F) @ Black Sludge
Ability: Regenerator
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
IVs: 0 Atk
- Scald
- Haze
- Recover
- Toxic

Tornadus-Therian (M) @ Rocky Helmet
Ability: Regenerator
EVs: 252 HP / 4 Def / 252 Spe
Timid Nature
- Hurricane
- Knock Off
- U-turn
- Defog

Scizor (M) @ Scizorite
Ability: Light Metal
EVs: 248 HP / 16 Def / 244 SpD
Impish Nature
- Swords Dance
- Bullet Punch
- Roost
- Knock Off

Greninja (M) @ Choice Specs
Ability: Battle Bond
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Hydro Pump
- Dark Pulse
- Water Shuriken
- Spikes

Heatran (M) @ Steelium Z
Ability: Flash Fire
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
IVs: 0 Atk
- Magma Storm
- Earth Power
- Flash Cannon
- Stealth Rock

Comments

Good but remember that you can't have duplicate items (you had 2 rocky helmets). Also Jolly Nature Fire Blast prob not a good Idea. Instead of Fire Blast maybe Iron Head because steel covers fairy in addition to ice. Plus it's physical so you would be using your higher attack stat.

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OU does not have items clause, so double Rocky Helmet is fine and very much standard on those Pokemon in OU.
Fire Blast is better than Iron Head because it hits Skarmory, Celesteela, Ferrothorn, etc.

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True. But Heatran already has a fire move so it can hit those pokemon you mentioned. Plus I don't think a Jolly nature is good for Fire Blast. But hey, do whatever. (Also didn't know items clause isn't in OU :P) If you still really want fire coverage then maybe fire punch. It's weaker but uses it's higher attack stat plus it's 100% accurate.