The enduring popularity of Pokémon Emerald (Gen III) has spawned numerous self-imposed challenge runs. The —a hybrid of the Nuzlocke and a randomized egg system—requires players to catch only the first Pokémon on a route, then immediately replace it with an egg obtained from an external source (e.g., a pre-generated “egg box” file). This creates high variance: a player might hatch a pseudo-legendary or a Magikarp. To facilitate this, players typically modify a digital ROM of Pokémon Emerald using third-party software.