As you can hear, the music has certainly changed to go along with your pursuit of Team Plasma. Head all the way back towards the bridge on over to Floccesy Ranch, where you'll see Hugh. Head south from there until you eventually see a Team Plasma Grunt just standing there. She has a Purrloin L14 on her team.
After beating her, she'll run off, and then Hugh will show up and suggest you go to Castelia City from the harbor in Virbank City. Sounds like a good idea!
Head back over to the harbor there and you'll see Roxie and her dad talking. Apparently they're cool with each other again or something and he's more than glad to take you on over to Castelia City with his boat. Go inside and then talk to Hugh, answer Yes, and then head on over to Castelia City!