You can actually get another entirely free team slot by putting Toxic Spikes > Heavy Slam on Forretress. Garbodor is really bad in OU and removing it would be for the best benefit for your team. Ingrain traps Ferrothorn in which is something that you don't want to happen, especially since so many Pokemon have adapted to be able to deal with Ferrothorn and every successful team has to be able to do so. Iron Defense is also pretty useless when most things that can beat it either spam Fire Blast or it can't do anything to them anyway and makes it more set-up bait. Plus, Ferrothorn + Forretress are rather redundant together anyway. Pick one or the other - Ferrothorn's typing is more useful to stop things like Rotom-W and stuff and isn't really so much set-up bait as Forretress is, but at the same time Forretress can run any combination of Spikes + SR + T-Spikes + Rapid Spin. Ferrothorn also gets semi-reliable recovery in Leech Seed.
Swampert is a much better defensive Pokemon than an offensive one. It doesn't hit hard enough. Try this set.
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Trait: Torrent
Relaxed Nature (+Def, -Spd)
Evs: 252 HP / 4 Atk / 252 Def
- Stealth Rock
- Ice Beam
- Earthquake
- Roar / Scald
Flygon is really outclassed in OU, especially with the kind of set that you're running for it. If you're so inclined to run Flygon, try using a Choice Band or Choice Scarf on it because it really doesn't hit as hard as it wants to be able to. Plus, you should also run Outrage > Dragon Tail, Stone Edge > Dragon Claw, and U-turn > Flamethrower. It's best when used as a scout kinda with U-turn. You can also run what I believe is the best Choice Scarfer in the metagame right now with an excellent combination of bulk, utility, and power in Choice Scarf Garchomp.
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Jolly Nature (+Spd, -SpA)
Evs: 252 Atk / 252 Spe / 4 HP
- Outrage
- Stone Edge
- Earthquake
- Fire Fang
There are other fixes you'll want for your team but that's a pretty good start for now, imo. Ask if you don't understand anything/have further questions/observations! C: