>>54472291No one knows, I'd say the sooner you get to it the better. Earliest guess from me would be once Indigo Disk releases because they would have ported almost all existing Pokemon between all their Switch games. Yes, there are still some specific mons without a Switch game but they could cover their asses with: "Grab them from Pokemon GO and put them in HOME if you want to complete your National Dex/get your OG Magearna"
However my guess has one glaring problem for GF which is Spinda and they haven't solved that:
Spinda exists in BDSP but it can't leave BDSP to HOME, nor other Spinda from HOME can transfer into BDSP. Spinda exists in GO but it can't leave GO to HOME either. Currently Spinda can only enter HOME from a Bank transfer. Therefore either Niantic, ILCA or GF itself have to fix their current problem with Spinda patterns before TPC/Nintendo shuts down Bank/3DS online services or they have to release a new game where this problem is not present.
We will have an advanced notice but don't expect it to be a lenghty grace period nor be notified 5+ years from now; companies hate pay (even if those are pennies) for legacy services and prefer to shut down if they can get away with it
