I wanted a Machoke and a Gurdurr egg so I bred a female Machoke with a male Hitmontop and a female Conkeldurr with a male Mienshao but the egg I got was of Machop and Timburr.Then how can I get Machoke and Gurdurr egg? Please help!
You can't. You can only get basiic stage Pokemon through breeding, regardless of the parents. You'll need to manually train up from the Machop/Timburr to get Machoke/Gurdurr
Machop and Timburr are the offsprings of Machoke and Conkeldurr not Machoke and Gurdurr all you need to do is evolve and you'll have what you wanted
You cant. The thing is, the Pokemon in the egg will always be its first evolution except a few like these and the legendary which cant breed except manphy