At the beginning of your journey, your pokemon inventory consists of 10 slots. This means you can only keep 10 pokemon with you.
This inventory limit will increase as you progress in your journey. The first action to get you more pokemon slots is obtaining the
Boulder Badge. For this, you need to defeat
Brock.
There is a lot of releasing of pokemon in this game.
There is also a PC mechanic where you can upload pokemon to. You can also download pokemon from your PC.
Check out
o!pc-inbox o!pc-upload and
o!pc-download
This PC can hold 96 pokemon, with 2 known increases. When you catch 5000 pokemon, the PC capacity increases to 120, and when you catch
10,000 pokemon, then it increases to 144.
QuadBox When you reach 15,000 catches, your pc-quadbox will be unlocked. The commands for this box are
o!pc-quadbox o!pc-upload-quadbox and
o!pc-download-quadbox
Shiny box There is a box in your PC to store shiny pokemon. The limit on this box is 1000.
The commands for interacting with this box are:
o!pc-shiny o!pc-uploadShiny and
o!pc-downloadShiny
Maxed There is a box in your PC to store pokemon that have reached level 40.
The commands for interacting with this box are:
o!pc-maxed o!pc-uploadMaxed and
o!pc-downloadMaxed
Max level was raised from 40 to 50, but this box will be kept as is.