think mine are still all on X & Y for battle tower purposes. Never transferred to S&S.
Reasonably decent Gyarados, staraptor and a few others specifically bred.
won't necessarily be level 100, but could level them also if the price is right.
Movesets will be for battle tower also.
google smogon and look at your version to get some idea of which pokemon you should be using, or google like gen 5 ubers teams. Contains mostly legendaries but some pokemon can slaughter legendaries under the right circumstances (i.e getting a kabutops with swords dance in rain can decimate an unprepared team).
I won't have anything particular interesting, have pokemon white 2 and pokemon Y, so in theory could attempt to get a legendary you may be missing from either of those. Save before the legendary fights, catch them if terrible stats then reload.
Pretty sure all my legendaries are basically trash in terms of IV's/natures.
Curious in roughly the amount you're thinking of paying per poke.