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Growlithe has been my baby ever since I saw his picture as a kid in the Pokemon Pathways to Adventure book. I never evolve him because I want him to stay the same. I remember I even wrote some piece of horrid self-insert fanfiction where I had a Growlithe on a Mareep farm.
Still my favorite. Sylveon's a second place, but nobody will ever dethrone Growlithe in my heart.