Challenge mode is a alternate version of Classic mode in PokéRogue, it can be selected after defeating Classic mode for the first time.
There are currently two types of challenges implemented in the game:
When selecting Mono Gen you are given the option to select a single generation from 1-9 and you may only use pokemon from that generation in battle during the run. (For Example: If you pick generation 1 you may only use gen 1 Pokémon).
Fusing a usable Pokémon with Pokémon that is outside of your chosen Generation will result in that Pokémon becoming unusable.
When selecting Mono Gen, the
Elite Four that spawns will always be from your chosen generation.
When selecting Mono Type, you are given the option to select 1 type from the current 18 types in game and you may only use pokemon that have that typing(For Example: If you pick mono water you may only use Pokémon that have a water typing).
You are also given the option to pick both a Mono Gen and Mono Type (ex: Picking generation 3 as your Mono Gen and fire as your Mono Type only lets you use generation 3 Pokémon with a fire typing).
After selecting your Challenges you are taken to the Starter Select screen where you may choose any starters you have unlocked that fit the criteria of your Mono Gen and/or Mono Type.
When selecting Pokémon for a Challenge run, you can initially only select Pokémon that fit the criteria of your Mono Gen and/or Mono Type. After selecting one Pokémon you can then select those that evolve or form change into that type, or evolve into that generation. They will be unable to be sent into battle until fully matching the parameters of the challenge.
Alternate forms are allowed in Mono Gen runs.
Alternate forms can and will violate Mono Type runs.
Terastalizing does not interact with the Mono Type challenge in any way, if a Pokemon was legal before Terastalizing it will still be legal even if you change it's type to a type other than the challenge, if it was illegal before Terastalizing and you change it's type to the type of your challenge it will still be illegal.
During the run you are able to catch Pokémon normally like in classic mode, However you may not send out Pokémon that do not fit the criteria of your Mono Gen and/or Mono Type run (ex: If you are doing a mono normal run and catch a Mamoswine, while you may have it in your party you may Not use it in battle.
Abilities that function outside of battle, such as Pickup or Honey Gather, will not function if the Pokémon that has them is unusable in battle.
In general, your challenge mode playthrough will function the same as a classic mode playthrough, just with the restrictions you choose for your challenges.
For information on what can happen during your classic/challenge mode playthrough, click here!