When Pokemon Sun & Moon released back in November, some players were distressed by its incompatibility with online storage service Pokemon Bank. That all changes today, as the Nintendo 3DS application has been updated to support the newest Pokemon generation.
You can now transfer your old Pokemon to Sun & Moon, opening up a wealth of new strategies for the Battle Tree, multiplayer, and beyond. This brings the total roster to 802 different species, not including regional variants. Updating the Bank app will also grant you a Mewnium Z-crystal as a bonus. This gives the legendary Pokemon Mew access to the powerful Genesis Supernova Z-Move in Sun & Moon, though you'll have to find Mew on your own. Hopefully you took advantage of the free download last year.
Pokemon Bank costs $5 per year and grants additional bonuses, like Battle Points and PokeMiles, depending on how much you use the service.
Source: Press Release