All you need to do is trade it with a friend, and it will evolve into Machamp.
dude you don't need a evolution stone to evolve machop, you just have to level it up to level 28. and then trade it.
Machop will start to evolve once it reaches Level 28.
Machop will begin to evolve once it reaches Level 28.
Machop evolve's on level 28 into Machoke and if u want machoke to evolve u have to trade him
Machop will evolve at level 28.
Machop evolves at level 28, then you have to trade Machoke to get Machamp.
It evolves into Machoke
Machop evolves into Machoke at level 28.
No you have to change it manually
you level the machop with a cheat
Level Machop up to lvl 28
Machop evolves in lv.28 into Machoke