List of Trainer levels, Pokémon GO Wiki
From 40 to 50 Stardust Cost! - Pokemon GO Stardust Guide for Level 40 to 50 Tasks. : r/TheSilphRoad
Pokémon GO Level 40 to 50 Guide - All Level Requirements and Rewards
Power Up Costs Pokemon GO Wiki - GamePress
Power Up Costs Pokemon GO Wiki - GamePress
Level 41 to Level 50 Rewards Discovered by Data Miners
Pokémon GO Level 40 to 50 Guide - All Level Requirements and Rewards
Pokemon Go: 41-50 Levelling Guide - Pro Game Guides
Easy reference charts for stardust/candy requirements by Pokémon level : r/TheSilphRoad
Pokemon Go Level 41-50 Requirements: Tasks and XP
Hi, I just hit level 25 and wrote a comprehensive guide to everything I know so far. : r/pokemongo