tons of stuff! tons!
maxing out stats (EV training which takes FOREVER)
figuring out movesets for every pokemon
thinking of new combos that aren't invented yet
think of ways to defeat the "common" pokemon like skarmory, dusclops, regi ice, etc...
2vs2 combos, which are rather less focused on in comparison to traditional 1vs1. There's still lots to do for 2vs2.
think of ways to use the un-usable. There are so much Pokemon that wants to make an appearance in RSbot.
Obtain more important items like lum berry, leftovers and etc.
i can mumble on and on... you get the point now i hope.