While I know very little of RU's meta, one thing you could try over a scarfer is a trickroom user with focus sash and magic guard if you're having trouble with getting trick room set up late game. Pity the only two pokemon able to do this in RU are duosion and sigilyph, but I used such a gimmick sigilyph in a UU trickroom team and I thought it fared okay.
Sigilyph @ Focus sash
252 HP, 252 Spa, 4 Sp def
The nice thing about sigilyph is that it can double as both a last resort TR setter and also what I essentially refer to as a golden bullet against sweepers, either neutering speed, or neutering boosts that could prove difficult to work around with your team. The two attacking moves I leave to you to decide.