Its impossible unless you hack. Combusken the is evolution of torchic, which is the fire starter pokemon. So the only way to get is hacks, evolve a torchic(which you must choose as a starter pokemon), or trade with a friend.
The only way is to migrate it from Ruby, Sapphire, or Emerald
It will evolve at level 36.
Into Blaziken at Level 36.
Level 36, I believe.
torchic involves into combusken at level 16
You'll need to migrate it from Pokemon Ruby, Sapphire, or Emerald to the Pal Park and catch it there.
Combusken is a Fighting and Fire type pokemon.
Torchick because it evolves into Combusken which evolves into Blaziken which is a Fire Fighting and I have the most sucess with him. Cobra030
There is no Pokemon mansion in sapphire.
He is not in Pokemon: Sapphire. You will not be able to find him. He is in Pokemon: Diamond, Pokemon: Pearl, and Pokemon: Platinum. You will definitely have trouble finding him in Pokemon: Sapphire.
In Emerald/Ruby/Sapphire, you go to Dewford town before you get a chance to battle a Combusken. There you need to get a fishing rod from a fisherman that is in Dewford, catch a water Pokemon with the Old Rod you now have, and level it up. Then by the time you get a chance to battle a Combusken put in that water Pokemon and sit back, relax, and put out Combuskens fire!
Combusken evolves into Blaziken starting at level 36. (Torchic evolves into Combusken starting at level 16). Combusken is #256 in the National Pokedex, and was introduced in the Generation III Pokemon titles (Ruby, Sapphire, and Emerald) where it was an evolution of one of the starter pokemon, Torchic. In Generation VI (X and Y), it is unobtainable by encounter. To obtain this pokemon, you must evolve a special edition Torchic from a Pokemon Event, or trade for it with another pokemon player, since other people have them and breed them.