*bulbagarden.net image removed*
What the- OP,
YOU FORGOT MASQUERAIN! >:[ (and yes, it is at least partially, if not fully, based on a moth - its Japanese name is
Amemoth). Gosh.
Anyway, despite Masquerain's
rude omission T_T, I voted for:
Ulgamoth.
Fire/Bug is such an awesome typing combination, especially when moths are naturally
prone to flames. It's also evocative of the great moth Mothra, and has
two amazing names (though I feel
Ulgamoth supersedes
Volcarona...) The wings are slightly weird, but they're OK, especially since they could be said to represent tiger lilies... Furthermore, all of its Pokedex entries are freaking awesome.
Honorable mentions:
Venomoth. A classic, and supposedly the true evolution of Metapod. The shiny form is just
beautiful, and the overall design is a terrific interpretation of the first Pokemon moth. And it's skilled with littering the foe with various potent powders, as well.
Mothim. A soothing (somewhat creamy/coffee-ish) color scheme, and is a nice take on a somewhat funky though streamlined moth design.
Dustox...as much as I love Generation 3 Pokemon, this one was just...weirdly designed. :x The design is tolerable, though, and the eyes are a bit cool. The shiny variant's coloration isn't half-bad, even.