Pokémon Storage has officially been increased in Pokémon GO. Niantic is now allowing players of its immensely-popular mobile game to hold a maximum of 4,000 Pokémon. To gain more storage, you can purchase more Storage Upgrades via the in-game shop. This number should be more than enough for all types of players!
Attention, Trainers! The limit on Pokémon storage has now been expanded to 4000.
Source: @PokemonGoApp
Pokémon Blog 
One thought on “Pokémon Storage has been increased in Pokémon GO to allow you to store up to 4,000 Pokémon”