By going to elite four and you pass a tunnel.
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That is really quite simple. All you have to do is breed a Hitmonchan or a Hitmonlee in Pokemon FireRed or LeafGreen and trade it on to Pokemon Emerald.
Use a ditto and hitmonchan to get tyrogue.
As of the sixth generation, Hitmonchan cannot evolve.
Hitmonchan does not have anything to evolve into. It pre-evolution is Tyrogue and depending on stats it will evolve into Hitmonchan or Hitmontop.
Hitmonchan learns ThunderPunch at level 31.