Hello, I am so happy you made this plug in, it is exactly what I wanted for my game! I am even more happy you got 2v2 battles to work, as all other pokemon-ish plugins I have found only support 1v1s.
However, just a heads up, but the update to the battle file on the 21st seems to be broken. It cause the game to crash every time I switch mons. I am no expert, and It may just be a problem on my end, but I think some part of the double battles changes are causing the BattleManager.actor().index() function to returning the wrong index. Every time it gets called in the Scene_Battle.prototype.updateYexiSwitch function, it ends up pointing to an undefined actor. That, or there might just something wrong with the switch function itself. I would have asked about it on discord, but the link on your front page is expired.
For now, I am fine, as I can use the old version of the battle file from the demo, but I hope you manage to fix this at some point. Thank you again for all your hard work!