Rate my VGC team

Question

Comments and critisim welcome. Any replacement ideas are welcome to.
And if someone could add in sprites. that be great :3
Ivs are 31 or 30 across the board.
Vaporeon (F) @ Sitrus Berry
Ability: Water Absorb
Level: 50
EVs: 224 HP / 140 SDef / 76 Def / 68 SAtk
Calm Nature
- Helping Hand
- Scald
- Ice Beam
- Protect

Tyranitar (M) @ Leftovers
Ability: Unnerve
Level: 50
EVs: 108 Spd / 152 Atk / 148 HP / 100 SDef
Careful Nature
- Dragon Dance
- Protect
- Crunch
- Smack Down

Venusaur-Mega (F) @ Venusaurite
Ability: Thick Fat
Level: 50
EVs: 156 SAtk / 224 HP / 116 SDef / 12 Spd
Calm Nature
- Sleep Powder
- Giga Drain
- Sludge Bomb
- Protect

Garchomp (M) @ Focus Sash
Ability: Rough Skin
Level: 50
EVs: 252 Spd / 252 Atk / 4 HP
Jolly Nature
- Dragon Claw
- Rock Slide
- Earthquake
- Protect

Malamar (M) @ Assault Vest
Ability: Contrary
Level: 50
EVs: 164 Atk / 204 HP / 92 SDef / 48 Def
Adamant Nature
- Psycho Cut
- Superpower
- Pluck
- Rock Slide

Gardevoir (F) @ Choice Scarf
Ability: Synchronize
Level: 50
EVs: 252 Spd / 252 SAtk / 4 SDef
Timid Nature
- Dazzling Gleam
- Magic Coat
- Psychic
- Thunderbolt

Comments

Maybe it'd be better if you furnish an explanation of those EV spreads (well, those that aren't 252/252/4) and the synergy of your team first.

i'll comment on the abilities/moves/basics instead:
1. Why run Smack Down on TTar? The only reasons I'd see you're using it is due to its perfect accuracy over Rock Slide's area of effect or Stone Edge's power. Unless you want to earthquake something that's flying or levitating with your Garchomp... KO'ing TTar in the process.
2. You have no fire attacks. You may consider a mixed TTar instead and have Fire Blast + Ice Beam instead of Dragon Dance + Smackdown.
3. You don't seem to have an answer to Mega Kangaskhan. (Before you say Superpower on Malamar, it only does 64% to a standard Mega Kanga spread at +0 attack, whereas it'll be 2HKO'd by Fake Out plus Return. Malamar is slower than Mega Kangaskhan. Scald is also not a guaranteed burn.)
4. You should take into account opposing Scarfed Garchomp, since it can 2HKO your Garchomp and Gardevoir. You can scare it off by putting in Vaporeon as lead.
5. I think Magic Coat is a Gen 5 move tutor move, if so, you can't have it on Gardevoir.

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Probably an obvious answer to this question, but why not not sandstream for t-tar?

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I would love to see a Explanation on those EVs please?