In this town:
Enter the Pokemon Center and talk to the old man to the left to receive TM66 Payback. Check out the hotel beside the pokemon center and pick up the Timer Ball in the northwest corner of the fence to the north.
Enter the hotel and head to the second floor. You'll find Mr. Bonding again on the third floor. Talk to him to receive the Speed Power O-power.
As you move towards the center of town, you'll spot a Team Flare Grunt ahead. After he leaves, enter the house north of the pokemon center and talk to the researcher inside to get an Everstone. Talk to the man inside as well and he'll inform you to talk with the guide to learn more about the stones in Route 10. Exit the house and go around the pokemon center and check the southwest corner to find a Soft Sand.
You'll find the guide on the way to the middle of town. She'll invite you to the hotel to tell you more about the stones. After that, you can leave the hotel. There's a new photo shot location further north of the hotel. Take a shot if you want. If you attempt to leave the town to the east, Korrina will stop you and challenge you to a battle.
Leader Korrina (Prize Money: 4,000)
Korrina's two Lucarios shouldn't be taken lightly. It can sharply rise its attack stats with Swords Dance and lower it's opponent's special defense by Metal Sound. It also has an attack that will also increase its special attack upon hitting the target. Fire, fighting and ground moves are effective against steel. Though Flying and Psyhic moves are effective against Fighting pokemon, Lucario's Steel-subtype will just cause these moves to deal normal damage.
Head to the northwest portion of the map to find the same Team Flare grunt leaving town. Your neighbor will arrive and talk to you shortly before leaving. If you follow that path, it will just lead you to a rock structure that you can't access at this point. After this event, just leave the town to the east.
Just a heads up I had to trigger the Flare event first before I could talk to guild and battle the gym leader.