So, I thought about something. What if we get a bot to farm 3000 Pidgey candies, and then farm 250 Pidgeys (to make your bag full of Pidgeys) and then evolve all 250 of them while using a lucky egg?
You get -
250 * 2000 (Pidgey amount * Exp per evolve)
1,250 * 200 (Pidgey amount * Exp per catch) - 1,000 Pidgeys required to get 3,000 candies to evolve 250 Pidgeys
And the entire process is 750,000 exp
It'll probably take too long wouldn't it?