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Did a nuzlocke on the game and lost 2 times before winning with pic related (first time against the 2v2 battle against Team Plasma with Tcheren attacking my pokemons for whatever reason, and second time against gym2, every time with oshawott starter).
Gym 2 is kino tho, get filtered plebs. You even have access to a battle item shop before the 2nd gym. It was one of the best fights in a pokemon game.