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Mine is a tie between Quilava, Absol, and Gallade.
Quilava cause I love the Cyndaquil line, but whereas Cyndaquil is adorable and baby-like, and Typhlosion looks like a grumpy old-man that would be able to take on the world, Quilava looks like the cool teen/young adult one that doesn't give two craps about anything.
Absol just because I like the "Harbinger of Disaster" thing, and I love the simple yet awesome design. He also has the Dark type, and pulls it off properly.
Gallade cause I like the gladiator/warrior vibe from him. The Ralts line was already probably the most human-like Pokemon in the 3rd gen, and the 4th gen made it even moreso. He just looks awesome, and seems just like the chilvarous, strong gentleman that the lady-like Gardevoir needs. I just love his design, especially the sword-arms.
Sorry I could make up my mind