I doubt it. They rarely if ever give random Pokemon like Golett/Golurk connections to major lore.
Hey, if Carbink can be connected to Diancie, why not?
This is a cool idea and I would be convinced if this is turns out to be canon hahaNo one has been able to identify the energy Golett and Golurk run on, according to card pokedex entries. In the new trailer for the Volcanion movie, Magearna is powered by some (dark) energy? Will it be somehow related to Golett and Golurk?
Well, seeing that Druddigon likes to run through tunnels made by Onix, and Unown some significant relationship with Arceus as revealed in the HGSS event, it seems safe to think Game Freak likes to connect Pokemon from different generations from time to time.I completely forgot about Carbink. Still though, Carbink was introduced in the same generation as Diancie, so that was planned from the get go. I doubt they would do the same for a Pokemon that's two generations old.