I hate making suggestions without first battling the team. But I'm pretty sure someone as experienced as me (I dislike Special Attackers, because I'm not... Modest. HaHa! Okay, you can hang me now) can answer without screwing things up.
Infernape and Breloom have incredibly similar roles (well they should, you have them as walls) so we'll replace one. I think Breloom would be the keeper on this team, so we'll replace Infernape. This team is lacking in the Special field. So I would suggest replacing Infernape for an offensive Heatran. While there is nothing wrong with Deoxys-D, Garchomp is now in OU. As such, we'll be replacing it with one of the Pokemon that can actually switch in on it: Bronzong. And finally, due to the popularity of Ferrothorn and Breloom, as well as a fairly large usage of Grass Knot, Giga Drain, or HP Grass, we'll be replacing Swampert. I think that Mamoswine might be of more help to your team.
Tentacruel: A lack of Special attacking on your side makes me want to use the more offensive varient of Tentacruel. It will still have that support ability, but it can actually do damage now.
Tentacruel (M) @ Life Orb/Wise Glasses
Trait: Liquid Ooze
EVs: 252 SAtk / 4 SDef / 252 Spd
Timid Nature (+Spd, -Atk)
- Hydro Pump
- Ice Beam
- Rapid Spin
- Toxic Spikes
Hydro Pump for STAB, Ice Beam is coverage. Rapid Spin and Toxic Spikes for support. Notice that I gave a choice between items. Life Orb causes recoil with Rapid Spin, which I'll always found unfortunate. But the lack of power with Wise Glasses is very significant. But the choice is still up to you.
Heatran:
Heatran (F) @ Air Balloon
Trait: Flash Fire
EVs: 252 SAtk / 4 SDef / 252 Spd
Modest Nature (+SAtk, -Atk)
- Earth Power
- Fire Blast
- Hidden Power [Ice]
- Stealth Rock
Your basic Heatran set. Earth Power and HP Ice for coverage, Fire Blast for STAB, Stealth Rock supports the team and allows you to net KOs.
Breloom: This guy needs a lot of work. While you most commonly see a Swords Dance+Life Orb set, I believe that a Choice Band set will be of more use to you.
Breloom (M) @ Choice Band
Trait: Technician
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature (+Spd, -SAtk)
- Bullet Seed
- Low Sweep
- Mach Punch
- Stone Edge
Bullet Seed is STAB boosted by Technician. Low Sweep is also STAB boosted by Technician. The ability to lower the Speed of switch-ins is very important. Mach Punch though can be used to quickly take down threats, either through Revenge kill or just massive power OHKOs. Stone Edge is to hit foes like Dragonite, Tornadus, just any Flying type.
Bronzong:
Bronzong @ Light Clay
Trait: Levitate
EVs: 252 HP / 160 Def / 96 SDef
Relaxed Nature (+Def, -Spd)
- Earthquake
- Gyro Ball
- Light Screen
- Reflect
Dual Screen helps support your frail Breloom and Tentacruel (who is physically frail) as well as bulkier Pokemon like Mamoswine, Heatran, and Salamence. It is also a set that I think better helps against Dragon types, who can be seen running mixed sets in order to take down walls. While physical defense is more important in my opinion, and thus why we have more Def, we make sure to give some attention to Special bulk.
Mamoswine:
Mamoswine (M) @ Life Orb
Trait: Thick Fat
EVs: 24 HP / 252 Atk / 232 Spd
Adamant Nature (+Atk, -SAtk)
- Earthquake
- Ice Shard
- Icicle Spear
- Stone Edge
A killer in the current metagame, which sees a lot of Pokemon weak to Ice, plus some weak to Ground (Landorus, Thundurus, Tornadus, Dragonite, Salamence, Garchomp, Hydreigon, Heatran, Breloom, Lati@s). Standard except for Speed/HP Evs, these are my preference. And Icicle Spear, my preference in dealing with Gliscor and Dragonite among others.
Salamence: Give the damn thing a Dragon Dance.
Salamence (M) @ Lum Berry
Trait: Moxie
EVs: 252 Atk / 4 SAtk / 252 Spd
Naughty Nature (+Atk, -SDef)
- Dragon Dance
- Earthquake
- Fire Blast
- Outrage
All together now in an importable copy:
Tentacruel (M) @ Life Orb
Trait: Liquid Ooze
EVs: 252 SAtk / 4 SDef / 252 Spd
Timid Nature (+Spd, -Atk)
- Hydro Pump
- Ice Beam
- Rapid Spin
- Toxic Spikes
Heatran (F) @ Air Balloon
Trait: Flash Fire
EVs: 252 SAtk / 4 SDef / 252 Spd
Modest Nature (+SAtk, -Atk)
- Earth Power
- Fire Blast
- Hidden Power [Ice]
- Stealth Rock
Breloom (M) @ Choice Band
Trait: Technician
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature (+Spd, -SAtk)
- Bullet Seed
- Low Sweep
- Mach Punch
- Stone Edge
Bronzong @ Light Clay
Trait: Levitate
EVs: 252 HP / 160 Def / 96 SDef
Relaxed Nature (+Def, -Spd)
- Earthquake
- Gyro Ball
- Light Screen
- Reflect
Mamoswine (M) @ Life Orb
Trait: Thick Fat
EVs: 24 HP / 252 Atk / 232 Spd
Adamant Nature (+Atk, -SAtk)
- Earthquake
- Ice Shard
- Icicle Spear
- Stone Edge
Salamence (M) @ Lum Berry
Trait: Moxie
EVs: 252 Atk / 4 SAtk / 252 Spd
Naughty Nature (+Atk, -SDef)
- Dragon Dance
- Earthquake
- Fire Blast
- Outrage