Next time, please keep communications under a single thread so it doesn't get messy.
1. Plugin order should be GBRO_UtilsCore > GBRO_BattleCore > GBRO_LoLegaiaBattle.
2. The battle core uses es2020 syntax so you'll need to update your MV's nwjs version if you're still using the default one that came with it. Follow this guide here and update to at least 0.44.x