Growlithe: 8/10
Arcanine: 9.4/10
Both are indeed amazing, but both suffer from the fact that I never used them in-game. Yet, I was charmed by their appearance, similar to the appearance of Magnemite (yeah, I like the inanimate-object Pokemon.)
Speaking of which, nominate the Magnemite line.
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WTH Duke; just, WTH