Extra space in your bag to carry more items or extra space for your Pokémon are items that you only can get by using PokéCoins. PokéCoins are Pokemon Go's currency, and you'll need them for some purposes in Pokemon Go or emergencies, such as being out of Poké balls when your bag is already full, so you can't get these items by spinning a Gym's disc.

 

● Find a Gym that belongs to your team and put your Pokémon there

● Find a Gym that belongs to another Team and defeat them to get the Gym's control

● When using Gyms to get PokéCoins, don't forget that you only need one of them, otherwise you'll be wasting your Pokémon's energy for no reason.

● When leaving your Pokémon to defend a Gym, don't forget to feed it whenever it be necessary 

● You can get PokéCoins by buying them with real money