I used your team on Showdown! a few times, and it works pretty good. It has a lot of coverage, and it's able to deal with a bunch of different threats.
There are a few things that I would change, however.
Your Typhlosion isn't fast enough. Give it a Choice Scarf. Also, swap out Eruption for Extrasensory. He can easily nab a few revenge kills
Your Salamence is AMAZING. Keep him. If you change anything, change Fly to Ariel Ace. Great set!
Your Metagross isn't too bad, either. However, he's too fragile. Give the EV's to Health and Special Defense.
Your Snorlax is alright, as well... However, Beethoven is spelled with two 'e's.
For Garchomp, I suggest swapping that Life Orb for Dragonium Z or a Lum Berry.
Tyranitar is also pretty good. (another set form Smogon). I suggest replacing Fire Punch with Ice Punch.
Your team actually works pretty well together. There's a lot of options for switching, and any one of them can potentially sweep the entire opposing team. Here it is with my suggested changes:
Aisha (Typhlosion) (F) @ Choice Scarf
Ability: Flash Fire
EVs: 4 HP / 252 SpA / 252 Spe
IVs: 0 Atk
- Focus Blast
- Hidden Power [Grass]
keira (Salamence) (F) @ Flyinium Z
EVs: 252 Atk / 4 Def / 252 Spe
- Dragon Dance
- Dragon Claw
- Aerial Ace
Metagross @ Life Orb
Ability: Clear Body
EVs: 252 HP / 4 Atk / 252 SpD
- Bullet Punch
- Power-Up Punch
Beethoven (Snorlax) (M) @ Leftovers
Ability: Thick Fat
EVs: 188 HP / 128 Def / 192 SpD
- Body Slam
Mau (Garchomp) (M) @ Dragonium Z
Ability: Rough Skin
EVs: 4 HP / 252 Atk / 252 Spe
- Stealth Rock
- Swords Dance
Maya (Tyranitar-Mega) (F) @ Tyranitarite
Ability: Sand Stream
EVs: 168 HP / 252 Atk / 88 Spe
- Stealth Rock
- Ice Punch
That's my two bits, hope It helps!