Just started to try out competitive battling. How is my first team?

[SparkyB98]

Garchomp @ Garchompite
Ability: Rough Skin
EVs: 4 HP / 252 Atk / 252 Spd
Adamant Nature
- Earthquake
- Dragon Claw
- Brick Break
- Swords Dance

Greninja @ Expert Belt
Ability: Protean
EVs: 4 Atk / 252 SAtk / 252 Spd
Timid Nature
- U-turn
- Extrasensory
- Surf
- Ice Beam

Togekiss @ Leftovers
Ability: Serene Grace
EVs: 252 HP / 252 SAtk / 4 SDef
Modest Nature
- Ancient Power
- Aura Sphere
- Heal Bell
- Air Slash

Trevenant @ Sitrus Berry
Ability: Harvest
EVs: 252 HP / 252 Atk / 4 SDef
Adamant Nature
- Will-O-Wisp
- Substitute
- Horn Leech
- Leech Seed

Mandibuzz (F) @ Leftovers
Ability: Overcoat
EVs: 252 HP / 252 Def / 4 SDef
Impish Nature
- Knock Off
- Whirlwind
- Defog
- Toxic

Rotom-Heat @ Wide Lens
Ability: Levitate
EVs: 128 Def / 252 SAtk / 128 SDef
Modest Nature
- Volt Switch
- Shadow Ball
- Overheat
- Protect

Suggestions?

 

[Darnell]

Hi there.
Before posting you might want to read the first post on this thread...
http://www.smogon.com/forums/threads/rules-read-before-making-an-rmt.3476652/

From the rules stated it shows that we need some information, at least 3 lines on why you have chosen the Pokemon to fit into this team and what role they play, this could help in suggesting a better Pokemon to cover weaknesses or does the job better in co operation with another Pokemon.
#2 Have at least three lines of information about each pokemon;

Other than that, you should be good to go.
Thanks! :]