Head to the Discord server, you'll find more help in there and even the entry you are looking for :) https://discord.gg/Jt4Uszrau2

Not sure if the invite link has expired or not but I want to know how you guys convert the Pokemon base stats to this system so I can add in custom Pokemon.

There isn't a special formula to it. Compare a given Pokémon's evolution stage to another similar one (Dragonite and Salamance, Charmander and Totadile, Butterfree and Dustox ect) and give it the same total stat base/max based on its contemporary. Build their max and base off the official Pokémon stat distributions. Then just fill in the moves and abilities for them. Generally, pseudo legendaries like late-evolving dragons or Pokémon like Metagross end up with one more base stat than, say, a third stage starter.