Can you rate my team? (OU/Wifi)

Question

This is my first competitive team. To be honest I don't really know what I'm doing. Any pointers and advice would be very helpful. Thanks to anyone who can help!

Charizard-Mega-Y @ Charizardite Y
Ability: Drought
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Flame Burst
- Roost
- Solar Beam
- Focus Blast

Greninja @ Life Orb
Ability: Protean
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Hydro Pump
- Ice Beam
- Extrasensory
- Dark Pulse

Metagross @ Leftovers
Ability: Clear Body
EVs: 252 HP / 252 Atk / 4 Def
Adamant Nature
- Zen Headbutt
- Thunder Punch
- Iron Head
- Ice Punch

Aegislash @ Leftovers
Ability: Stance Change
EVs: 252 HP / 252 Atk / 4 Def
Brave Nature
- Gyro Ball
- Swords Dance
- King's Shield
- Pursuit

Garchomp @ Rocky Helmet
Ability: Rough Skin
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Stone Edge
- Earthquake
- Dragon Claw
- Fire Fang

Gengar @ Life Orb
Ability: Levitate
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Shadow Ball
- Destiny Bond
- Sludge Bomb
- Dark Pulse

I just bred a Sylveon with Modest Nature and Pixilate, so any tips on a moveset would be great too!

Thanks again!

Comments

This is singles, right?

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That's where I'm starting now, ya.

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Mega Charizard Y must have Heat Wave instead of Flamethrower. This mega is best used in Doubles because of its high Special Attack, it can be a wreck to the opponent. Plus,  it is a bit better than Flamethrower.

Gengar should keep Destiny Bond, but must hold Focus Sash. In case Gengar wasn't able to knock out a bulky pokemon, and has a frail defense, Focus Sash can help it survive. Destiny Bond can trick the opponent when he is attacking it, and his pokemon will be out with yours

Answer 1

Charizard: Replace flame burst with flamethrower for more power.

Metagross: Replace leftovers with assault vest for more bulk. Replace thunder punch with earthquake for at least regular effectiveness against all Pokemon.

Garchomp: Replace stone edge and fire fang with swords dance (potentially starts a sweep) and iron head (full weakness coverage).

Gengar: Replace destiny bond and dark pulse with focus blase (covers dark weakness) and giga drain (healing).

Comments

Pursuit works on Aegi because Pursuit Trapping exists, and Aegislash does a good job at it. And Iron Head Garchomp is worse than Fire Fang for coverage purposes.

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How is iron head worse than fire fang? Garchomp isn't checked by steel, grass, or bug Pokemon.

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Fire Fang specifically for things like Ferro, Skarm and Scizor.