Originally posted by Cryptic
Hold on to them. If you want to rank up quickly, just keep capturing a fuck load of pidgeys, caterpie, and weedle.
They all take 12 candies a piece to evolve them once, at 500XP per evolution. You can get a fuck load in within 30 mins. During a lucky egg that evolution xp is increased to 1K.
I think it just wasn't added to my inventory because it was full lol