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I did everything BW2 has to offer. The Black Tower, the round 2 of the Elite 4, every superboss, all landmarks, and without using items in battles. I enjoyed this playthrough the most out of all the games I did, and had quite a load of close calls in battles.
In terms of difficulty of the games of such a restricted challenge of the games I completed, I'd go
Colosseum>>>Platinum>BW2 (Challenge Mode)>FRLG>*POWER GAP*>HGSS>*POWER GAP*>ORAS.
Now I just gotta beat XY (if I ever get around to it), XD, and continue my USUM challenge.