Welcome to the Pokemon Tabletop Reunited: Evolved System, better known as PTR 2e.
For full info on this system please check out the Wiki. For any questions, please join our Discord
Installing the system is incredibly easy, just plug the manifest URL into Foundry's System Install window:
https://github.com/pokemon-tabletop-reunited/ptr2e/releases/latest/download/system.json
Alongside this you'll likely want to install the basic sprite collection too (this is a Module not a System):
https://github.com/pokemon-tabletop-reunited/PTR2e-Pokemon-Sprite-Collection/releases/latest/download/module.json