I can't find any concrete information on this, so I will ask here:

It's generally accepted that until gen 7, soul dew's effects are nullified in battling facilities, like the battle frontier. However, I simply can't find any concrete information on this, and the games don't tell you if that's the case. Is this true, and if so, does this also apply to games like colosseum or in white treehollow, where ubers are allowed?