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Those are my rules for a Ultra Hardcore Nuzlocke:
Species clause:If it’s the same Pokemon you find in the area and you caught it earlier this doesn’t count as a new encounter, catching the same Pokemon found can break the rules.
Typing Clause:If the Pokemon found in that area is a Pokemon that overlaps the typing of some of your teammembers, it cannot be caught otherwise it can break the rules.
No Overleveling past Gym Leader/E4’s ace:If some of your team members is above a Gym Leader/E4’s ace (e.g.: Misty’s Starmie) needs to be boxed until getting the badge.
No items or held items in battle:You already know the drill.
Rest of the rules comes from the normal nuzlocke rules from thisBulbapedia article.