The Mont Vallon lift can be closed when the weather is not good (there can be snow event in summer). You can get to starting point going uphill from Méribel following piste de La Truite, or going down from the Tougnette.
From Mottaret, go up to Les Sitelles restaurant. From there take left and up to the Mont Vallon lift.
To go down, follow the unique track going down in the valley.