Pokemon Go: Rewards, XP, and unlockable items for every level
Pokémon GO: How To Level Up (Your Trainer) Like A Pro
Pokemon GO】PvP Finder(32コメント)
XP requirements for Levels so far (1-25+) : r/TheSilphRoad
Field Research Quests List
All Pokémon GO level up rewards and requirements, 1-50
Field Research Quests List
Stats of the week: the seismic growth of Pokémon Go - ClickZ
Pokemon GO: How to See Pokemon Level and CP