You can only catch the first Pokémon you encounter in each named area.

You must play the game in a single sitting. No naps, no overnight breaks. If you fall asleep, the run is over.

In a randomizer, you cannot rely on shops having what you need. If items are randomized, every Potion or Pokéball you find is a godsend. Manage your PP carefully; running out of moves at 4:00 AM when your brain is foggy is a quick way to lose your starter. 2. The Ultra Necrozma Safety Net

Are you playing with "Similar Strength" on? If so, you won't see a Mewtwo on Route 1. If you’re playing "Global Randomization," prepare for the worst. Most "top" runs use "Extreme" settings where movesets are also randomized, meaning your Fire-type might suddenly learn Leaf Storm. The "Enlac" Community Influence

At its core, a is a standard Nuzlocke with one massive, physical twist: The game does not stop until it is finished, and the player cannot sleep until the credits roll.

Pokémon Ultra Moon is the preferred choice for Sleeplockers because of its density. The Alola region is packed with cutscenes, trials, and the infamous fight.

In a randomized setting, Ultra Moon becomes a minefield. You might walk into a trial expecting a Totem Raticate and instead find a Totem Rayquaza with the Huge Power ability. The "enlac top" tier of players thrives on this unpredictability, often using specific ROM patches to ensure the difficulty remains "top" tier throughout the 20+ hours of gameplay. Survival Tips for the "Enlac Top" Tier

Wild Pokémon, trainer rosters, items, and sometimes even types and moves are completely randomized to keep you on your toes. Why Ultra Moon?

If a Pokémon faints, it’s considered dead and must be boxed or released.