Not sure if this is general bug and not sure if this is limited to just my setup.
Basicly Skiers seem to bug out and disappear when moving. No other NPCs are behaving this way for me, only the skiers.
This was taken on Route 216
After arriving to Sinnoh and visiting house next doors to grannies, I got cornered by an uncultured and rowdy shinx.
Please place a tree or something in that corner. Also that NPC staring at wall is kinda creepy.