With Machamp as the Forest Champion it was shown to be strong, powerful, caring and helpful and developed a good rivalry with Ash's Hawlucha. It also believes in a fair fight when it challenged Hawlucha to a one on one fight. But doesn't like to be tricked when it discovered the true colors of the Forest Bullies.
Machamp was once the Forest Champion in a forest that Ash and his friends were coming across. Until, one day it met Hawlucha and the two often battled each other; since Machamp lost most of the battles with Hawlucha it gave the title to him. So Machamp left for the mountains to train.
It was still training in the mountains until he saw Ursaring and Conkeldurr coming to tell it that Hawlucha is terrorizing the forest Pokémon. When Ash was helping Hawlucha master Flying Press, Machamp appeared with Conkeldurr and Ursaring to challenge Hawlucha to a battle.
Shortly after the two started the battle, both Conkeldurr and Ursaring brutally attacked Hawlucha to everyone surprise including Machamp's. Before the duo could land the final blow Machamp knocked them both out and took them away.
After Hawlucha agreed to travel with Ash, Machamp was reinstated as the Forest Champion.