nuzlocke.app

Nuzlocke Tracker - For all Pokémon games and Rom Hacks to record, track, advise on encounters, and provide boss battles & level caps. Maintained by domtronn on GitHub, where it has earned 158 stars from the community.

It's actively developed around nuzlocke, nuzlocke-generator, nuzlocke-tracker, and is a solid reference for anyone building with these tools.