What are EX Challenges?
Pokémon Masters Guide
Ex Challenges are the hardest battles that you can encounter in the game. Completing these challenges provides you with materials in order to obtain and upgrade gear for your Sync Pairs.
This mode can only be unlocked once you complete "Challenge Cheren & Hilbert & Hilda" on Hard Mode Co-Op. You can then check the EX challenges under Training.
These challenges can be completed on Hard or Very Hard. Recommended strength levels are 20,000 above. Here you'll be able to challenge Brock, Rosa, Erika, Skyla, Barry, Flannery, as well as Korrina.
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