What kind of monotype runs have you all done before, and how did you like them?

Just getting off an OR Bug type run and had fun, final team ended up being Beautifly, Masquerain, Ninjask, Pinsir, and Heracross (with Latios as HM slave). This was following a Normal run in HG and a Fairy run in Y. I liked the Normal run but the Fairy run was a little too OP for me, even taking into account how easy XY are. Was thinking of trying Steel in BW2 but also worried it might make it too easy so debating on other games/types to try.