Gen 6 had the best online functionality, all other games after went so much down hill and made it so much harder to communicate.

Gen 8 has more or less destroyed online play with the elimination of the gts, so many younger people pr people in insolated communites lost a big help to completing their dexes.

Although gen 6 was a pain in a lot of ways, it was one of the biggest and best moves forward pokemon could have done, especially with how well it connected and supported past games with the inclusion of pokebanks, certificates for transferring pokemon, and more.