how to increase pokemon go level

How to expand Pokemon 'warehouse' in Pokemon GO
in pokemon go, you will be allowed to contain a certain amount of pokemon. when the pokemon warehouse is full, the amount of pokemon allowed is exceeded, the player will receive an error.
How to catch Dragonite, Snorlax, Gyarados and other rare Pokemon in Pokemon GO?
the rare pokemon in the game are always difficult to catch and also difficult to meet them to toss pokeball. but if you own one or two pokemon with strong cp will help strengthen your team strength a lot.