I think right now my list would go like...
Espeon
Jolteon
Umbreon
Flareon
Vaporeon
I'm not gonna rank the Gen IVs until I experience them myself, but based on looks alone they're both pretty cool and would go somewhere between Jolteon and Flareon.
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K | H | A | Q | Q | A | H | K
"we're about 50 years behind the rest of western society." -icon on B8