Allow me to explain. Completely unlike the Reborn League Challenge, a Monotype Challenge is where a player cuts through the story mode of the games, using only one type of Pokémon. Sound easy? Then I invite you to see for yourself.
Of course, some, such as... water or flying will be much easier than others, like ghost or ice. In fact, some are flat out impossible due to a lack of variety. But that's no consequence. Shall we begin? I'll start with the rules-
1. Obviously, you may only use Pokémon of the type you have chosen (with the following exceptions)
2. You may use dual-types,