I don't think 3v1's are possible but I know you can make battles where you lose and the game still continues. You could make the first battle a forced loss and then have Mew show up to make the second battle possible.
FsT/110 submitted a new resource:
Let's Go Exclusive Moves and Forms - Adds Partner Pikachu, Partner Eevee and their exclusive moves from Let's Go
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A simple resource which adds 2 new forms for Pikachu and Eevee as well as their exclusive moves. If the sprites look weird in battle just copy the sprites for Pikachu/Eevee and make sure the names match the ones in the PBS.
Exception `ArgumentError' at Section031:29 - comparison of Integer with nil failed
I followed the instructions but it didn't work so I tried copying the Main script from a vanilla project and now this keeps showing up.
I got this error because of Blazing Soul, Bad Company works so I'm not sure what's wrong.
Exception `NameError' at [Radical Red Ability Pack] Ability Handler.rb:96 - undefined local variable or method ` move' for main:Object
I get this error message whenever a battle starts. If it matters I already had EBUI installed before getting CBUI and CEBUI.
Exception `NoMethodError' at [[DBK] Enhanced Battle UI] [000] Main.rb:377 - undefined method `clear' for nil:NilClass
Maybe it's just because I'm on V21.1 but I got this error message while trying to compile.
Exception `NameError' at [Improved AI] AI_EffectScores.rb:5 - undefined method `pbGetMoveScoreFunctionCode' for class `Battle::AI'