As mentioned already, this belongs in the Battle Subway section, but I'm not too stingy about the details.
Your biggest problem right now is that your Pokemon are too offensive for the Doubles format, and can get shut down by setup or defensive Pokemon. This is pretty easy to patch up, though, so here's what I recommend:
Amoongus @Black Sludge
Ability: Regenerator
252 HP / 200 Def / 56 SpDef
Nature: Calm
- Spore
- Rage Powder
- Giga Drain
- Protect
A good pairing for Gardevoir, this will tank any unwelcome SE attacks aimed at Gardevoir. I'd suggest putting Calm Mind on Gardevoir instead of Focus Blast, since a boosted Hyper Voice or Shadow Ball/Thunderbolt is better in most cases, and Rage Powder almost guarantees you get at least one free turn of setup.
Sableye @Leftovers
Ability: Prankster
252 HP / 252 Def / 4 SpDef
Nature: Bold
- Will-O-Wisp
- Recover
- Snarl
- Taunt
For Arcanine, a Sableye. Paired with Intimidate, you effectively shuts down Physical Attackers with the Burn. If they attempt to swap in a Special Attacker, you can use Snarl to knock down that stat. If they send in their own annoying tank, you've got Taunt to shut them down.
Talonflame @Life Orb
Ability: Gale Wings
252 Atk / 252 Spd / 4 Def
Nature: Jolly
- U-Turn
- Tailwind
- Brave Bird
- Flare Blitz
Simply a good revenge killer/scouter. You can send this in whenever one of yours goes down to get Brave Bird/Flare Blitz damage, then bail with U-Turn. You can also use Tailwind to support any of your sweepers, since they all run +Damage natures, meaning they're prone to losing speed ties.
