Hey I have a kind of stupid question. Does anyone know any good fire Pokemon..

Yes, your Flygon can learn fire moves like:fire blast, flamethrower etc.

But I say you should get an Aggron in your party because he can learn lot kind of moves(electric,fire,ice,steel,rock,fighting.water etc)and kick out wailord because you have Milotic and they are in the same type.

Flygon can learn fireblast

Cammerupt or Torcoal

Groudon is d the best!!!
I'll tell you how you get it plus i'll place an additional kyogre here(you need to finish the game if you have NOT yet finished the game I prefer torkoal)
GROUDON
Moves Needed: optional HM02 (Fly)
After you beat the Elite Four, go to the Weather Institute and talk to the guy that gave you Castform.He will say a drought is in route 114. Go in Terra Cave and go through some doors to find the Lv70 Groudon catch it.
KYOGRE
Moves Needed: HM08(Dive), HM03(Surf), optional HM02 (Fly)
After you get Groudon, go back to the guy and he says theres a rainfall in Route 105. Dive in a patch of water and go in the cave, Marine Cave. Go to the Lv70 Kyogre catch it.

Aggron could learn fire moves because I tought my Fire Blast.

Sure Aggron can learn Fire moves! TM's 11-Sunny Day, 35-Flamethrower, 38-Fire Blast, can be taught as well as Fire Punch (learned moves with bp's afterwards). Or if you have an older version like R/S, or know someone, you could just breed a Torchic/Combusken/Blaziken and trade it over, or if you had one already use it.(Personally, I have all the starters in my game.) Otherwise, Torkoal might be a better bet than Numel/Camerupt, as his stats are all the same or better than theirs,except maybe speed, and his White Smoke ability eliminates stat reductions. Oh, and there's also Vulpix/Ninetales.(Near Mt. Pyre, on the outside). And Houndour/Houndoom after you beat the Elite 4, in the new Safari Zone section. But, I think Aggron would make the perfect addition to your team as he's a great Pokemon anyway!