This isn't a player. It's an NPC in
Gary Fans quest. To do that you most do the
Ash Mission quest first.. Kinda long quest, if you wonder... You cannot talk to those NPC's who are placed around many places at the map before you done
Ash Mission quest, and then talked to Gary Oak NPC.
If you want more information about those quests, just use our quest pages, hope this helps you
.