What changes from a standard Nuzlocke
A hardcore run keeps both core rules intact —only the first encounter in each area, and a fainted Pokémon is gone for good— and adds restrictions so that major battles are won through preparation rather than level or item advantage. If the basics are not clear yet, start with the Nuzlocke rules and clauses.
Beyond those three pieces there is no settled consensus. Some players add fighting every trainer, banning candies or limiting purchases. These are fair preferences, but present them as rules of your series, not as “the hardcore rules”.
Hardcore runs raise more edge cases than the standard challenge. Deciding them in the middle of a tough battle tends to produce rules tailored to the moment.
Bag items and held items
The usual restriction covers items you use from the bag during a battle: potions, status cures, revives and boosters such as X Attack. A held item works on its own during battle and usually stays allowed: Berries, Leftovers and similar items are part of preparing the team.
- Outside battle: healing with items or at a Pokémon Center is still allowed unless your ruleset limits it. Reviving a fainted Pokémon never brings it back to the team: the death has already happened.
- Poké Balls: you can throw them in wild battles; they are not healing items.
- Items the opponent uses: what rival trainers do depends on the game and is outside your control; it does not affect your rules.
Also decide what happens to a held item that is lost or stolen mid-battle. The simplest answer is to accept the result and not replace it until the battle ends.
Set mode and applying it voluntarily
Many games in the series include a battle style option with two values: one asks whether you want to switch Pokémon after you knock out an opponent, and the other does not. Its name varies by game and language; the community calls it Set mode. Choosing it removes the free switch: after you knock out an opponent, the next one comes in against your current Pokémon.
If your game lacks the option, apply it voluntarily and write down which switches are allowed:
- Switching by spending your turn, like any normal switch.
- Switches caused by a move or an ability.
- Replacing a fainted Pokémon, which is always required.
What is ruled out is using the game's prompt to see the next opponent and bring in a type advantage for free.
Level caps and extra experience
The most common rule sets the cap at the level of the strongest Pokémon in the next required battle: Gym Leader, mandatory rival fight, story villain or League. Before that battle, no team member you plan to use may exceed it.
The practical problem is extra experience. Some games let you turn shared experience off and others do not; check how yours works before choosing a game. If a Pokémon goes over the cap, the usual options are to box it until the battle, rotate members through optional fights or skip optional trainers with the full team.
Levelling up during the boss battle is normally fine: the cap is checked when the battle starts. If you want a different rule, write it down.
Pokémon League conventions
The League chains several battles without a Pokémon Center visit, so the level cap can be read in more than one way. None is mandatory; pick one and apply it to the whole League:
Also decide whether you may leave the League to train between fights when the game allows it, and whether healing with items between fights is allowed. In the usual hardcore ruleset, healing outside battle is fine.
Training, candies and personal choices
Rare Candies and, in the games that have them, Exp. Candies speed up progress a lot. With a level cap, their real effect is saving grinding time: they cannot take you past the cap. Even so, there are three reasonable positions:
- Allowed within the cap: useful to bring fresh catches up to speed.
- Found items only: candies found on the map are fine, but none are bought or farmed.
- Banned: every level comes from battles.
Tell apart a personal choice, which you can adjust between runs, from the ruleset of a shared or community challenge, which must be followed as published. If you join an organised challenge, its text takes precedence over this guide.
Unclear situations and how to settle them
Hardcore rules template
Copy this block into the difficulty section of your ruleset. Fill in every bracket before your first catch.
HARDCORE RULES · [series name] - Bag items in battle: banned. - Held items: [allowed / banned]. If lost in battle: [not replaced until it ends]. - Battle style: [Set in Options / Set applied voluntarily]. - Allowed switches: spending a turn, forced by a move or ability, and replacing a fainted Pokémon. - Level cap: [equal to / one below / ... levels above] the strongest Pokémon in the next required battle. - Accidental extra experience: [box until after the battle / ... level tolerated]. - League: [Champion's cap / per-member cap / first member's cap]. - Candies: [allowed within the cap / found only / banned]. - Optional battles: [no cap / same cap].
The full ruleset, with areas, gifts and deaths, is in the Nuzlocke rules template and the series kit.
Sources and approach
The three core restrictions match the hardcore description published by Smogon University in its introduction to Nuzlockes. The cap, League and candy alternatives are common variations; none is better or worse, they only change the difficulty. Each game's options (battle style, shared experience) vary between generations and versions: check yours.