Same way you evolve a Machoke in any other Pokemon game. You have to trade it to a different generation four Pokemon game. (ex. Diamond/Pearl/Platinum or HeartGold/SoulSilver)
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You cant evolve machoke up by levelling him up. You have to trade to evolve machoke.
You cannot evolve Machoke into Machamp without trading Machoke, it must be traded in order to evolve it, there is no other way to evolve it.
to evolve machoke you need to trade it
It will evolve to Machoke about level 28. Machoke will evolve to Machamp when traded.
i always say just trade and evolve it when your machop evolves into machoke.