Jax received Torchic from Professor Birch shortly after arriving to Hoenn. While initially weak and cowardly Torchic used to have a fear of battling Pokemon that were bigger than it. However it was forced to face its fears in the face of Seviper who had injured Jax when he protected Torchic from it's Poison Tail. Upon facing its fears Torchic was able to evolve into Combusken and quickly finished of Seviper.
Combusken was later used in Jax's Gym battle against Wattson where he faced of with Manectric. Early on in the battle Combusken was paralyzed and was unable to keep up with Manectric assault, however with word of encouragement from Jax urging Combusken to get up and fight, stating that he stilled believed in him. Moved by it's Trainers support Combusken was able to activate its Blaze ability and with a powerful Fire Spin he was able to not only trap Manectric and limit its movements but also inflict burn on it. With both Pokemon exhausted and at their limit the battle came down to a clash of Fire Spin and Charge Beam ending in a draw. However moved by Jax and Combusken's passion Wattson still rewarded them with the Dynamo Badge.
Blaziken, as a Torchic, was shown to not take losing very well, often getting sad and depressed upon his loses, one such example is where he fought and lost to Treecko.