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I'm interested in trying out a new challenge of a leaderlocke and wondering how to pull it off. I feel like it's been done already but hey.
The main thought of it is depending on the region, you start with the eight pokemon that the main gym leaders and they are in your box in their first stages so e.g. kanto you start with onix, staryu, pikachu, etc. but you have to catch a normal wild pokemon for one of them to count (in a substitution like an egglocke) but you can only use those specific pokemon, if they faint they die and can't be replaced.