Pokemon Partners

Pokemon Partners are important characters of all Pokemon games.

Overview
At the start of the game, you choose what Pokemon you will be playing as, and another Pokemon as your partner Pokemon.

They stay with you for most of the game, and cannot be removed from your team, unless you finished the Main Story (Except in Explorers, you can remove them after you defeat Dialga and stop the planet's paralysis.

Rules
There are specific rules to choosing partners, for example, you cannot choose a partner that is the same type as the character your playing (Ex. You choose Torchic to play as yourself, you cannot choose Charmander, but you can choose Mudkip)