gen 3 ou team

Question

Moltres @ Leftovers
Ability: Pressure
EVs: 252 HP / 4 Def / 252 SpD
Modest Nature
IVs: 0 Atk
- Fire Blast
- Will-O-Wisp
- Protect
- Roar

Flygon @ Choice Band
Ability: Levitate
EVs: 252 Atk / 4 SpA / 252 Spe
Hasty Nature
- Earthquake
- Rock Slide
- Hidden Power [Flying]
- Facade

main damage dealer facade for burn or toxic

Swampert @ Leftovers
Ability: Torrent
EVs: 252 HP / 252 Def / 4 SpA
Calm Nature
IVs: 0 Atk
- Surf
- Protect
- Roar
- Rest

Forretress @ Leftovers
Ability: Sturdy
EVs: 252 HP / 4 Def / 252 SpD
Careful Nature
- Spikes
- Rapid Spin
- Earthquake
- Explosion

Tyranitar @ Leftovers
Ability: Sand Stream
EVs: 252 HP / 66 Def / 190 SpA
Modest Nature
IVs: 0 Atk
- Surf
- Pursuit
- Flamethrower
- Thunderbolt

Jirachi @ Leftovers
Ability: Serene Grace
EVs: 4 HP / 252 Def / 252 SpA
Modest Nature
IVs: 0 Atk
- Thunderbolt
- Wish
- Psychic
- Calm Mind

Answer 1

Moltres:
Gen 3 Moltres is seen as a all out offensive pokemon so having HP and SPD trained on it makes no sense, I would also run something like Sunny day Fire blast Solar beam Substitute/Will-o-wisp.
Flygon:
I like the idea of choice band even though it's not really seen that much since it's attacking stats are not that great but I would drop hasty nature for adamant since you are not running a mixed set, also I would drop facade and get Double Edge for more power.
Swampert:
As a defensive set and running protect it's pointless to have unless you run something like toxic for more stall and since your team is more on the aggressive side I wouldn't use it as a Roaring pokemon so I would drop for something like Skarmory.
Tyranitar:
Honestly this pokemon is best used as a physical attacker with something like Dragon Dance Rockslide Earthquake and HP bug, If anything you could run it as a mixed attacker with Rockslide Earthquake Crunch and Fireblast/Icebeam.
Those are just the pokemon I would really look at right now but I feel like honestly Flygon is not that great compared to something like Salamence especially if you plan on using Flygon as a physical attacker since Salamence just has overall better stats for the job.
Also if you do run Skar I would drop Forrestress for something else and get something that can be a supporter with heal bell ect.