Pokémon Go XP sources list: How to get XP fast in Pokémon Go
Pokemon Go: Tips on powering up Pokemon, evolution, stardust and candies
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Pokémon Go level requirements
Latias & Latios Raid Guide Infographic by Team gtr-Storm (Individual guides linked in comments) : r/TheSilphRoad
Pokemon Go - Level Up Guide - DigitalTQ
All Pokémon GO level up rewards and requirements, 1-50
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Pokémon Go level requirements, level up item rewards list explained
Pokémon Go level requirements
Pokémon Go Level Up Guide