>>35126936i rarely do this because its really hard to make a team out of in most games but use only 3 stage evos or single stage pokemon.
monotypes are fun too. so is using pokemon only in that region (which has to be the case if youre playing kanto or BW)
other than that idk. i make up rules on the fly and never really set them up beforehand. like if im following a walkthrough (which i usually only do so i know which pokemon are on each route) ill look at the next gym leaders team and go "okay, i wont get my pokemon above that level" yknow?
i used to only ever use teams with no repeating types but i gave up on that cause ive done it so much.
also if youre playing gen 6 or 7 do NOT use exp share. it makes it so much more enjoyable, to me at least.