Super thankful to PeachClamNine for making a custom plugin that allowed me to modify and make even new battle motions. It's pretty complex to explain so I'm thinking of making a devlog post later on explaining how it works in better detail, but basically you just need to mess around with the PC9_CustomActorMotions plugin in the www > js > plugins folder. Yanfly's Action Sequence Packs plugins allows you to setup when motions happen once the skill is used.