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I agree with NahimC on Psychic because it doesn't really provide any useful coverage options. You also might want to test Morning Sun and a more bulky EV spread.
I noticed the strong trouble you have in the weather war. You might want to test a Sunny Day Version of Ninetails instead ala
Ninetales @Leftovers
Trait: Drought
EVs: 128 HP / 252 SpA / 20 SpD / 108 Spd
Modest Nature (+SpA, -Atk)
-Flamethrower/Fireblast
-SolarBeam
-Sunny Day
-Will-O-Wisp...
Over all the team doesn't look to bad. I'd agree with switch Swampert for Gastrodon and moving stealth rocks to Heatran. Gastrodon is even more useful for absorbing the water type attacks that Tryanitar, and Heatran draw out.
You team gets wrecked by Heatran offensive, just looking at it. Even neutral hits from Fire Blast are devastating. Also Tangagrowth is also really vulnerable to revenge killing from Mamoswine which which can OHKO with Icicle Crash, or two hit OK with Ice Shard, and priority.
So for Heatran...
Typhlosion (m) (Choice Specs)
Trait: Flash Fire
EVs: 252 SpA / 4 SpD / 252 Spe
Modest nature (+SpA, -Atk)
-Eruption
-Focus Blast
-Hidden Power (Rock)
-Fire Blast
Switches in on Lava Plume and smashes faces with a supper effective Hidden Power. Than proceeds to seep for game.
Typhlosin nets a potential to hit kill with Choice specs. Scolipede with sword Dance and countless others get firm two hit kills. Well not countless 22. Not even different sets different pokemon. Calcs found here http://www.honko.freehosting.com/wall_calc.html
Also this is based on the dual...