need help with my team.

hey everyone im not sure about EV's and IV's that everyone is talking about nore do i understand natures. i have what i believe to be a decent working team for just playing my friends but i made a bet this past weekend. if i win this battle my friend buys me a copy of one of the remakes of gold and silver and if he wins i have to buy him one.

Skarmory-no item
Ability-Keen Eye
Naive
HP-309
SP.ATK-154
ATK-234
SP.DEF-192
DEF-354
SPD-235
Stealth rok
Air slash
Roar
Toxic

Tyranitar-Soft Sand
Ability-Sand Stream
Impish
HP-394
SP.ATK-258
ATK-350
SP.DEF-270
DEF-328
SPD-220
Crunch
Earthquake
Stone Edge
Dragon Claw

Garchomp-no item
Ability-Sand Veil
Timid
HP-419
SP.ATK-258
ATK-322
SP.DEF-268
DEF-288
SPD-332
Dragon Rush
Earthquake
Crunch
Dragon Claw

Aerodactyl-no item
Ability-Pressure
Hasty
HP-353
SP.ATK-202
ATK-292
SP.DEF-249
DEF-193
SPD-386
Iron Head
Dragon Claw
Earthquake
Crunch

Metagross-muscle Band
Ability-Clear Body
Jolly
HP-348
SP.ATK-237
ATK-353
SP.DEF-259
DEF-351
SPD-228
Hammer Arm
Meteor Mash
Zen Headbutt
Earthquake

Aggron-no item
Ability-Rock Head
Calm
HP-335
SP.ATK-192
ATK-261
SP.DEF-239
DEF-434
SPD-183
Iron Head
Dragon Claw
Metal Burst
Earthquake

i realize Garchomp is an uber pokemon but the friends im playing with dont mind it so i figured i should go for it. any team suggestions are welcomed and item suggestions would be great as well as move sets. im new to this sight so sorry if this in the wrong area but i figured this was the best place for the thread; thanks for the help

→ This is a COMPETITIVE Pokémon forum
No in-game teams, period. Anything works, even six Plusle could work in-game, thus it's moot to post it here. Competitive only, if it's in-game, we will reject it.

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→ Teams are REQUIRED to list EVs, Items, Natures, Ability (if it has more than one) and the obvious four moves
This is a moderated forum, meaning, threads must be approved by S&M staff before it shows up. As the rule says, you're required to have these in your thread for every Pokémon. If not, there's no chance you'll get it through.

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Locking because of these rules. Stats =/= evs. Pm/VM a mod to get this unlocked if you wish to sort out these problems and you can edit your thread to adhere to said rules.

~Locked~