After starting White 2 again and transferring up a Sableye, I've got all the way to Nimbasa city in the space of 3 days. Didn't struggle with any leaders, but it's a hassle grinding my Pokemon in desert resort before tackling Elesa. I caught N's Scraggy, however, and found his Sigilyph at least 4 times, but it escaped each time using whirlwind. Going to teach Sableye taunt as a precaution if a encounter it again.
My team as it stands: