So I started reading this thread before I got White, and I thought people were just exaggerated about Elesa.
But nope, she's an awful pain in the butt.
Volt Switch hits pretty hard, surprisingly. My Boldore comes close to OHKOing Emolga (if I get lucky with Rock Blast), but then she heals them up and I'm dead within two Rock Blasts. Flying destroys my Petilil and Pignite, and Sandile can get a few hits in but Sand Tomb is my only Ground attack and it doesn't hit hard at all (I can get it to hit Emolga if I use Smack Down first, but even then it's still weak). Yamask doesn't do much except spread Mummy, and Sigilyph is OHKOed by Volt Switch.
Boooooo.