The system works like this: The characters have individual bars by their names that fill up based on their individual speed stats. (kotaku.com)
She excels at jumping around with a higher than average speed stat. (nintendochitchat.com)
This Dusk Form is pretty similar to Lycanroc's Midday Form but with a generally slightly higher Attack stat and slightly lower Speed stat. (attackofthefanboy.com)