Water Stone

Located on the corner of the rooftop. You’ll need to take the ladder down to the long rooftop, and then drop on the eastern rooftop containing the item.

You need to create the icy bridge to reach this.

Located at the end of the pier.

Found on the scaffolding.

Found on the roof of Passage du Palais.

Lumiose Sewers, Main Access. North-west from the center.