A Monotype Pokemon is a type of challenge run in the Pokemon games where the player catches and trains Pokemon that only belong to a certain type, such as Water, Bug, Dark, or Dragon. In this challenge, all the Pokemon on the players team must share a common type, and both single- and dual-type Pokemon are allowed. This challenge is a great way to form a team around your favorite type(s) and not have to worry much about picking your favorites, but it can be challenging as the teams weaknesses must be taken into account.

Monotype runs are self-imposed challenges where players limit themselves to one type, similar to a Gym Leader. The challenge can be done in any Pokemon game, and some games are better suited for Monotype Runs than others. For instance, Pokemon Sword and Shield, followed by Generation 6 and 7, are considered the best games for a Monotype Run because of the staggering amount of Pokemon that can be caught in them.

Monotype Pokemon can also help players develop a playstyle in Pokemon. According to a Reddit post, Monotype Runs can be a fun and rewarding way to play the Pokemon games.