Originally Posted by Fat Team Magma Boss Maxie
Well what happens when you accidently catch a secod poke on the same route and only realise when you have alread capture/nicknamed it? I need to know as soon because i just stuffed up my chapter
I would release it, the rules are to only catch the first Pokemon you run into. If you really wanted to keep it you could make an exception and sacrifice a different area, but it's not really in the spirit of Nuzlocke to do that.