Why not have top 6? (No particular order)
Galvantula - My absol-lute favorite these days. One of the few good things to come out of gen 5. Bug/Electric is an amazing combo and he just destroys everything with thunder/compound eyes, especially in single player.
Heracross - Just cool. His mega-evolution is amazingly amazing. Bullet seed, rock blastx5 is pro pro mode. He was my sexy beast in gen 2 as well.
Feraligatr - Of course, as we can see by gen 2 domination, gen 2 was my first and my best gen. My favorite starter is certainly this, and he is just beast mode quite frankly. HE'S AN ALIGATOR.
Absol - Smooth, sexy, lovable... I named my first email account after this beast. He just looks so cool. Gen 3 brought some nice characters like Armaldo, Flygon, Sharpedo, and Dusclops, but Absol tops them all.
Scizor - Faborite pokemon as a elemantary kid student. He is just such a boss and even sexier than his precedent, Scyther. That new mega-evolution is pretty ugly, albeit op.
Togekiss - I previously payed no attention to the togepi line until the introduction of gen 6. FAIRY TYPE is pretty cool. Togekiss just exemplifies the amazingness of fairy with great sp def/atk, speed and useful and varrying moves.