Froslass is my favorite Ice-type and Ghost-type, so I voted for her. I love her stats, her typing and her moveset. I've used one on Pokémon Online and she rocked as a lead with a Timid nature (+Speed, -Attack). She had the time to put one or two layers of Spikes, which are pretty useful, then get a kill with Destiny Bond. Sometimes, if she had a type advantage, she could defeat the opposing lead with either Ice Beam or Shadow Ball, then take the revenge killer down with her using Destiny Bond. Assuming she is faster, of course. However, that would mean no Spikes, but it's a good sacrifice to beat two opposing Pokémon.
After some discussion with another mod, it is decided that this contest isn't necessary (as with other "Ugly Pokémon" contests), as there is already a "What is the Ugliest Pokémon" thread that basically serves the same purpose of expressing opinions on which Pokémon is the ugliest. Basically, the Contest Hall threads are a place to discuss match-ups rather than choosing a Pokémon based on a single characteristic as the flavour text suggests in the title, which is best done as a thread in Pokémon World (like the aforementioned thread).