What variation of the Nuzlocke challenge is he going with and on what game?
Does it start as soon as you begin the game or once you’ve received the pokeballs? Is he going with the rule that you have to release your starter? Or that if the first pokemon you encounter on a route is one you already own then it doesn’t count and you can re-encounter? Shiny clause?
Wow that was a lot of questions, sorry, but yeah, what rule set is it?