Originally Posted by MuhFugginMoose
Actually I would say that we should keep on going, as it is stated before by Taodragon these sort of things are not unprecedented, in fact, when considering the Jirachi and Manaphy distributions as well as other event Pokémon(Collosseum's Celebi, Ranger Deoxys etc.) it is actually the norm
since Gen III(though if you count Stadium events, it is since Gen I but we didn't have spin-off game legendary distributions for two generations).
In fact, the some of the few reasons why this wasn't as extreme in Gen V were because Global Link allowed for most of the distributions, the others were kept as standard shop events and infinite TMs, lack of cross-generational item transferring, Join Avenue, Dream World and Dream Radar made all other alternate item grinding methods pointless. And of course all of the spin-offs that weren't the former two were completely independent of the main series.
Though of course, adding new species would require game data update, so would adding new formes/new Megas. And giving away legendaries from spin-offs wouldn't necessarily equate to them having new forms as we still have no legendaries with their Hidden Abilities outside of Mewtwo, Lugia/Ho-oh Kami Trio and Creation Trio.