So I tried using this with v20.1 and it failed to load correctly. Here's the error:
[Pokémon Essentials version 20.1]
Exception: NoMethodError
Message: undefined method `get_player' for GameData::Metadata:Class
Backtrace:
[Non-binary Support] 001_UI_Load.rb:170:in `pbSetParty'
[Non-binary...