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I want to give the last boss of my game more than 6 pokemon, how would I go about making it so only trainers can have more than 6 pokemon (not the player)?
I believe the engine has many checks that prevent this, will it's possible it won't be easy. I recommend you instead made the character battle once again after the first battle ends. The player's hp and pps will be the same so it won't really change much.