Yes, it is - a three days journey on foot from New Bark. But it can be made quicker - with certain Pokemon -

[Alright, this is as good as he's going to get, he thinks. His armor might slow him down in this case, since he doesn't have his Crest to back him up, so he will have to leave it with the others... That will be fine.]

[Boots, jacket, cloak...]

Once I get there, I will make my way down the route to you. Actually, I may try flying, for that is quicker...

[Does Dimitri know how to ride on a flying creature good? Don't worry about it.]