Well, all I'm doing right now is completing my Pokédex. That way, if I ever need anything or see a trade request for something, I can work on it. I might even do a massive in-breeding program and ensure I always have a perfect specimen for each species; I happen to have a flawless Japanese Ditto, and that is just absolute GOLD when it comes to breeding. I ended up with only five of the six Power items in trades, so after completing Johto (barring a legendary or two, but Ho-oh is a planned trade and I already have Celebi and Lugia) I'll have to head to the Battle Subway with a good team and attempt to conquer it so I can get my missing item - then keep conquering it and fill up my TMs (I already ARed the Lock Capsule in SS and will one day transfer it to get TM95 in B/W, the only way to obtain it - and no longer a legitimacy issue with B2/W2 out and Snarl being available there). LMAO
I just scanned my list from Johto. Suicine and Ho-oh are the remaining legendaries (Suicine still cruising, now in Kanto, and Ho-oh the trade; I still have to catch Entei but got an Unova trade for a Lv.100 Shiny Entei). Togepi, Natu, Marill (or Azurill but I can breed that with the incense), Sudowoodo, Hoppip, and Wooper are the next six uncaught families in Unova. Unown (have all 26 "letters", can get ? and ! once I have Ho-oh), Girafarig, Slugma, and Skarmory are the remaining families. I've got one of each in SS (except Slugma, which is only in Kanto but accessible) and can legally capture more of the majority of them. For Sudowoodo, I might have to try to breed a Bonsly (using a clone, I'll leave the original untouched for now), or at worst can breed a legitimate Lv.1 Sudowoodo if I don't have the incense for it yet, while I have to breed another Togepi. As for evolutions, I can evolve Steelix, Scizor, Houndoom, Kingdra, and Blissey now, meaning Johto will be complete before Kanto. :D So once that's done (shouldn't take long), I can make a list. ;)