I'm really taking my time and enjoying the game. So far, I'm at 56 hours and only have 5 badges
. I've given up on having a favorite Pokemon and even favorite type (although I'm still partial to the water type); there were just too many Pokemon I really like to choose from!
So this playthrough, I'm training a lot of different Pokemon. I'm also trying to train more than just 6 main Pokemon; so far, I've got around 20 Pokemon at even levels that I've been switching in and out. My "ultimate" team for the Elite Four is Empoleon (my starter), Gallade, Magmortar, Glaceon, Tangrowth, and Vespiquen (all some of my favorite Pokemon).
Otherwise, I've just been taking it slow and doing everything. I'm doing some EV training and trying to get natures that at least aren't hindering, but the serious training can wait until later (if I do it at all). I've started to become a lot less competitive; in Diamond, I was spending hours trying to get ideal IVs, natures, etc. It took the fun out of the game. I'll leave perfection for the metagame, and go with what I have for in-game battles!