Quote Originally Posted by 1AZRAEL1 View Post
Pop a lucky egg if you're gonna evolve a heap of Pidgey, gains a lot of XP that way. And try catch more than 100 Magikarp, get the one you want to the highest CP you can before evolving
Yeah the pidgey evolving seems to be the most efficient way. I farmed up 300 candies then popped an egg and just started evolving. It's a boring 30 mins but gets you a lot of xp fast.

I would also suggest waiting until you are at least well into the 20s before evolving your magikarp. I made this mistake early and now it costs a hell of a lot of stardust to increase CP every time I lvl up.