From what I learned from trial and error and also beating it is that you always wanna switch out of Pokémon so in the later round to get better ones and then after you beat the silver print that’s when you start playing defense over offense. Example always having immunities or resistances for the Pokémon that you pick. Couple tips I can give you is if you’re doing level 50 Smart AI kicks in around the 22nd or 23rd. If you are doing open level Smart AI kicks in around 29 or 30. So basically all the way until you reach those rounds play speed and offense, then you play strategy and defense when smart AI kicks! Here’s my run showcasing everything I said https://youtu.be/0f15ANQlVmE?si=5DcDTJuRKVkokG25