Legends: Arceus RNG


This guide provides detailed instructions on RNG abusing Legendary Pokemon in Legends: Arceus, leveraging RNG generator scripts and Sysbot forks crafted by Lusamine & Zyro670.

From here it is assumed you are using a CFW Switch console running Atmosphere. This guide is also focused towards users running Windows OS.

Looking for a retail focused guide? You are in the wrong place! Click here!

Required Reading


You can RNG manipulate every Legendary & Mythical encounter to attain desired IVs & Nature combinations. The method used will vary depending on whether the encounter is associated with Main RNG or Spawner RNG.

RNG Type Distinctions:
What is Main RNG?

Main RNG operates as a continually ticking hidden state, requiring precise timing of the final inputs before the Pokemon is generated in order to achieve the desired result.

Main RNG Encounters:
  • Dialga or Palkia - Origin
  • Dialga or Palkia - Non-Origin
  • Giratina
  • Regigigas
  • Arceus
SysBot.NET - Moarencounterbots is capable of accurately monitoring your Main RNG seeds in real time.
What is Spawner RNG?

Spawners contain specific Pokemon visible in the overworld. When the Pokemon is knocked out and respawned, the spawner seed advances by 1 frame. Achieving the desired result involves respawning the Pokemon a certain number of times in succession until you reach your target frame.

Spawner RNG Encounters:
  • Lake Trio - Uxie, Mesprit & Azelf
  • Weather Quartet - Tornadus, Thundurus, Landorus & Enamorus
  • Heatran
  • Cresselia
  • Manaphy/Phione
  • Shaymin
  • Darkrai
SysBot.NET - NotForkBot is capable of accurately monitoring your Spawner RNG seeds in real time & automating the process of looking for a desirable seed.

Setup & Installation


The required downloads you will need will depend on the type of encounter you wish to RNG abuse. You do not need to follow Main RNG setup if you plan to RNG abuse a Pokemon on a spawner, and vice versa.

Required Downloads:
Main RNG Setup
  1. Extract the contents of Moarencounterbots.zip into an empty folder in a known location.
  2. Download the latest version of LINQPad and place it in an empty folder.
  3. Grab the latest release of PokeViewer.NET, then extract the contents into a fresh, empty folder.
  4. Download the latest release of sys-botbase and extract the atmosphere folder to the root of your Switch SD card, then reboot the console.
SysBot.NET does not come pre-configured to use with Legends: Arceus automatically. Follow these instructions before continuing.

Spawner RNG Setup
  1. Download NotForkBot.NET by following the instructions on the NotForkBot Wiki.
  2. Extract the contents of NotForkBot-x64.zip into an empty folder in a known location.
  3. Grab the latest release of PokeViewer.NET, then extract the contents into a fresh, empty folder.
  4. Download the latest release of sys-botbase and extract the atmosphere folder to the root of your Switch SD card, then reboot the console.
SysBot.NET does not come pre-configured to use with Legends: Arceus automatically. Follow these instructions before continuing.

To avoid complexity, each of the RNG methods will be covered on a seperate page. Click on the button(s) that apply to you to get started.


Click here if the Pokemon you wish to RNG abuse is tied to Main RNG!
Click here if the Pokemon you wish to RNG abuse is tied to Spawner RNG!