need help with vgc '15 team

[laelaps90]

I'm trying to build a team around my mega gardevoir can you suggest some pokemon so far I got

Gardevoir-Mega @ Gardevoirite
Ability: Pixilate
EVs: 252 SpA / 252 Spe
Timid Nature
- Protect
- Hyper Voice
- Psyshock
- Focus Blast


Rotom-Heat
Ability: Levitate
EVs: 248 HP / 8 SpA / 252 SpD
Calm Nature
- Overheat
- Volt Switch
- Will-O-Wisp
- Protect


Garchomp @ Rocky Helmet
Ability: Rough Skin
Level: 89
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Rock Slide
- Protect
- Earthquake
- Dragon Claw