I agree with some the above, though Ariados really needs an evolution imo. It just looks so tame in its current stage and it isn't really that strong either. I reckon the design would be something really awesome, like a giant, ferocious spider, or something among those lines.
Also, yeah, Seviper really needs an evolution, especially with the screw-up 4Kids made in the "Who's that Pokémon", where it apparently was Arbok's evolution >_<
oh, yeah. I'll agree with Ariados as well. That could actually look pretty awesome.
tell me about it -_- misinformation about Arbok displeases me. I heard of people thinking that in the TV show Jessie's Seviper was Jessie's Arbok just evolved.