Well... it depends what Pokemon game your playing.
But ill say this: probably lv. 27, 28, or 29 I'm sorry I forget xD and im sure about this: if want a machamp trade it o.o
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Machop is a fighting type pokemon.
Machop evolves at level 28, then you have to trade Machoke to get Machamp.
You may capture a Machop in Fiery Path or Jagged Pass in Pokemon Emerald.
I'd say Mareep, Totadile, Machop, and Growlith.
Machop evolves into Machoke at level 28.