Help with my gen 7 hyper offense team, again

Question

Honestly, hyper offense is just not my thing but it is something I really wanna learn so, here's my third hyper offense team so please help

Aerodactyl @ Focus Sash
Ability: Unnerve
EVs: 252 HP / 4 Def / 252 Spe
Timid Nature
- Taunt
- Tailwind
- Protect
- Stealth Rock

Serperior @ Leftovers
Ability: Contrary
EVs: 56 HP / 200 SpA / 252 Spe
Timid Nature
- Glare
- Substitute
- Leaf Storm
- Leech Seed

Volcarona @ Sitrus Berry
Ability: Flame Body
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Psychic
- Substitute
- Fiery Dance
- Quiver Dance

Kartana @ Choice Scarf
Ability: Beast Boost
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Defog
- Leaf Blade
- Smart Strike
- Sacred Sword

Garchomp @ Dragonium Z
Ability: Rough Skin
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Outrage
- Stone Edge
- Earthquake
- Swords Dance

Gyarados-Mega @ Gyaradosite
Ability: Mold Breaker
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Crunch
- Waterfall
- Earthquake
- Dragon Dance

Comments

A couple of things I noticed:
1. Taunt on aerodactyl = kill, so maybe add one damaging move.
2. Substitute won't work well on a timid volcarona because it has low physical defense - i would give it bug buzz instead because it has STAB and maybe give it a focus sash so it can safely set up a quiver dance.

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Serperior needs some other attack move besides leaf storm. Leech seed is great, but against something like a talonflame or ferrothorn leaf storm (and leech seed for ferrothorn) just won't cut it. I would recommend something like dragon pulse, pretty good special damage

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Oh and you might be saying well dragon pulse isn't very effective on  ferrothorn but you don't even have to use that. A hidden power works too

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@DekuScrub Aerodactyl is just a suicide lead anyway and it's doubtful anything is gonna outspeed it

Yeah I thought as much. It originally had giga drain, fiery dance, bug buzz and quiver dance but I replaced the two moves because the pseudo legendary from alola walls it completely. Also, the sitrus berry is for instant heal if it takes stealth rocks. Not too sure if that's a good idea though

@sm 4evr Is that really a good idea since if Ferrothorn switches in on Serperior, then Volcarona gets a free entry and a free quiver dance?

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Low physical defence isn't really a reason not to use Substitute. Most attacks will break subs regardless. The move is for turning matchups against Pokemon that spread status more favourable.
Having said that, Roost is generally accepted as the better move for Volcarona, sometimes used with Lum Berry to address the status problem. It's super viable to run bulk on this Pokemon and let Quiver Dance provide the power you need.
I don't remember the Gen 7 meta well enough to comment on the coverage it's using, but I know that Psychic is chosen over Bug Buzz in Gen 8 because of Kommo and Pex. I'd imagine the same still applies.