List of Trainer levels

The first 40 Levels requires a certain amount of Experience Points and for achieving each level Trainer is rewarded with certain items.

Leveling-up past level 40 requires XP and Level-Up Researches. This mechanic was announced in the update GO Beyond.

Level-up Researches
Task rewards will be awarded automatically upon completion.

Changes

 * Some requirements have change after Level-up Researches were released worldwide.
 * Level 44: the fourth task was "Win 20 Trainer Battles in the GO Battle League"
 * Level 47: the third task was "Power up 6 Pokémon to their max CP"
 * Level 48: the first task was "Receive 20 Souvenirs from your buddy"
 * Level 48: minor text change of the fourth task was "Walk 25 km in a week 8 times"
 * Level 50: the fourth task was "Archive rank 20 in the GO Battle League"
 * Level 50: the official blog mentioned using Pokémon under 1,500 CP to defeat Team GO Rocket Leader. Now Pokémon up to 2,500 CP are allowed.