Pokemon Black Friend Code: 3954-9200-0435
Karrablast. It's so hideous!
I'd say Volbeat. I have no idea why, but it's always struck me as hideous.
Sawk, I hate how it has an asymmetrical face. I doubt it even lifts.
A Shiny Onix. It's a stone earthworm that's a barfy greenish-tan color.
As for normal colorations, I'd say Lickilicky. It looks like it somehow got inflated and that ginormous tongue basically plugging its mouth is the only thing keeping it from deflating and puking its guts out. Lickitung had a more prehensile tongue, while Lickilicky's tongue is only good for blowing raspberries and plugging up the mouth.
Team Battle Maison
Claimed: Golett ~ Iron Fist ~ Shadow Punch ~ Big Pearl ~ Light Clay.
Infernape. Besides it's ugly ass mug and colour scheme, Infernape has so many unnecessary widgets and out of place design choices that just make the whole design an eyesore.
The Rotom appliances are a close second. They're literally just floating appliances coloured the most hideous shade of orange.