Need ideas to fill a team for doubles

[tudor28]

Hey there. I need some ideas to fill my team for doubles. Here i have the first half:

1) Servine - Item: Eviolite - Ability: Contrary
Nature: Bold
EV's: 200HP, 120 DEF, 188 SPDEF
Moves:
Protect
Glare
Giga Drain
Leaf Storm

2) Rotom - Wash - Item: Sitrus Berry - Ability: Levitate
Nature: Bold
EV's: 248 HP, 216 DEF, 44 SP. DEF
Moves:
Protect
Will-O-Wisp
Thunderbolt
Hydro Pump

3) Heatran - Item: Choice Scarf - Ability: Flash Fire
Nature: Timid
EV's: 56 HP, 252 SP. ATK, 200 SPD
Moves:
Heat Wave
Earth Power
Flash Cannon
Ancient Power

Heatran is there to take the fire and poison attacks for servine, since he is immune thx to his ability and steel type, and also because ice, bug and flying won't do that much damage. Heatran also is there to destroy the threats for servine and the grass threat for rotom-wash, and rotom is there to cancel the ground and water threats for heatran.

Now i just need 3 more pokemons that can fill this team, and since i already have 3 sp. attackers in my team, i would need the rest of 3 to be attackers. Also I would like a bulky pokemon.

Here are some videos how the strategy works:
HLHG-WWWW-WW28-DRUJ
RWXG-WWWW-WWW28-DJR5
7LTW-WWWW-WW28-DJQB

Any idea is welcomed. Even if it means to change some of the pokemons, except servine.