Ok so I originally decided to build my Sinnoh Frontier Team after I was done with the Factory, but that doesn't seem to happen anytime soon, so I just decided to build it now. 3 scripted encounters and 3 bred mons in my Heart Gold cart that compliment each others strenghts and weaknesses, while personally trying to avoid any mon I used in my Hoenn Frontier team, to have more variety (so no Salamence, Heracross, etc). I think these 6 frens are more than enough to beat all the facilities, I just finished their EV training and I already love my team so much.
Also I changed my 'main Trainer Card'. Decided to include Shiny Mamoswine, since I always seem to run with a lot of luck with the Swinub line. My first legit shiny ever, bred a shiny one years later in SWSH by mere accident, ran into a perfect attack shiny Swinub in a fangame after that (it was Rejuvenation, and I know the shiny rate is higher but still, of all Pokemon...). So yeah, it's destiny at this point. Sorry Hydreigon.