Nate and Hugh are childhood friends from Aspertia City. Hugh has a strong hatred for Team Plasma after they stole his little sister's Purrloin, and he and Nate support each other through the ongoing battle against evil. The name "greyskyshipping" comes from Nate being the metaphorical sun that lights up Hugh's cloudy sky.
— In the games —
— Stills from the animated trailer —
— Fan art —
My thoughts - Both my White 2 playthroughs have been as Rosa but I still ship Nate with Hugh, although less than I ship the other two. Solid!!!