This tutorial will explain how you can get mobility stones in Jeanne d’Arc. These skills will let you travel longer distances per turn.
After the 22nd stage of the campaign, you will unlock the Tower of Alsace. By beating this stage, you will then be able to unlock Raillement.
In this location, there are three Thieves that hold Mobility +1. You can use the Skill Shakedown ability of Colet, or the Skill Snatcher ability of Rose, to steal the Mobility +1 stones before completing the stage.
In order to get Mobility +2, you need to combine two Mobility +1 stones together. Alternatively, you can also combine Mobility +1 with Raise Mobility to get Mobility +2.
The Raise Mobility skill stones are a lot more common since you can get them from Qrow Knights and Qrow Leaders. You can find a bunch of these at the Tower of Alsace.
Once you are ready, combine the ingredients to get Mobility +2.