Alright, your team is pretty good, but it does need improvements, so here they are.
Infernape
Mixednape is okay, but this team needs more special so go with this set. Its a fully special set and has a few better moves on it.
Infernape (M) @ Focus Sash / Life Orb
Trait: Blaze
EVs: 252 SAtk / 4 SDef / 252 Spd
Modest Nature (+SAtk, -Atk)
- Fire Blast / Overheat
- Focus Blast /
- Vacuum Wave / U-Turn
- Hidden Power [Grass]
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Staraptor
Your set is okay, but it isn't using Staraptor's potential, so go with this. Roost is okay with Staraptor, but its most likely going to get KO'd if it gets hit by something anyway.
Staraptor (F) @ Choice Band / Choice Scarf
Trait: Reckless
EVs: 252 Atk / 4 SDef / 252 Spd
Adamant Nature (+Atk, -SAtk)
- U-turn
- Close Combat
- Brave Bird
- Return / Double Edge
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Spirtomb
Spirtomb is good, but I ALWAYS prefer Sableye, but you can still used Spirtomb, so I'll give you a good set for both.
Sableye (M) @ Leftovers
Trait: Prankster
EVs: 252 HP / 88 Def / 168 SDef
Calm Nature (+SDef, -Atk)
- Taunt
- Will-O-Wisp
- Substitute
- Recover
OR
Spiritomb (M) @ Leftovers
Trait: Pressure
EVs: 252 HP / 108 Def / 36 SAtk / 112 SDef
Modest Nature (+SAtk, -Atk)
- Ominous Wind
- Substitute
- Hidden Power [Fighting]
- Pain Split
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Claydol
Although Claydol is good, Forretress outclasses it by quite a bit, because it call learn Toxic Spikes AND Spikes, which is a good combo AND has Rapid Spin.
Forretress (M) @ Leftovers
Trait: Sturdy
EVs: 252 HP / 4 Def / 252 SDef
Careful Nature (+SDef, -SAtk)
- Spikes
- Toxic Spikes
- Earthquake
- Rapid Spin
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Heracross
Heracross is good, but you already have a Fighting type, so go for Porygon-Z.
WARNING THIS IS A VERY RISKY SET, ONLY USE HYPER BEAM WHEN YOU KNOW YOU CAN TAKE WHATEVER HIT THAT IS USED WHEN YOU ARE RECHARGING. So if your to scared to use Hyper Beam, use Tri Attack and Choice Specs.
Porygon-Z @ Normal Gem / Choice Specs
Trait: Adaptability
EVs: 4 Def / 252 SAtk / 252 Spd
Modest Nature (+SAtk, -Atk)
- Hyper Beam / Tri Attack
- Thunderbolt
- Ice Beam
- Psychic
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Alomomola
Most of the team has moves that recover health, so Alomomola isn't really needed, so go with Swampert.
Swampert (F) @ Leftovers
Trait: Torrent
EVs: 252 HP / 68 Atk / 188 SDef
Adamant Nature (+Atk, -SAtk)
- Ice Punch
- Earthquake
- Stealth Rock
- Waterfall
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I hope I helped you!