you cannot unless you hack
i don't think there is a thing call a hitmonchamp i know there is a hitmonlee a hitmonchane and a hitmontop but not sure of a hitmonchamp but in firered when you beat the dojo you a choice for a hitmonlee or hitmonchane in leafgreen you will have a choice of hitmonleee and hitmontop You can get hitmonchamp in Pokemon ranger, the first one I think, you go to summerland? and then into the jungle and to the right. This location maybe wrong, but I am sure you can get hitmonchamp in this game.
no such thing
I'm sure you mean 'Hitmonchan' and to answer your question is an impossibility. Hitmonlee does NOT evolve into a Hitmonchan. They're two differently categorized Pokemon that just happen to be placed right next to each other in number, but they have no connection for evolution.
In the Dark cave hear the end. Once you are done battleing him he will give you apokemon. It will be the first eolvement of hitmonchamp, hitmonlee, and hitmontop.if you put it in the daycare with a ditto and they will have another in a egg so youcan try and get all the evolvements.Mr. Siedschlag
to get tyrouge in pokemon leaf green you need to breed your hitmonchan/hitmonlee which you had got after defeating fighting dojo, with a ditto. you have to breed them in day care center in island 4.go to the day care in 4 island and put in ditto and hitmonlee or hitmonchamp