To me, this Gen is where the coolest pokemon are, Gen IV being an incredibly close second.
The creation of Dark and Steel types just pushed me overboard here.
From the first time I saw it, I wanted an Umbreon.
Same goes with Scizor, but I had to wait on that because I had no one to trade with. But you could catch a Sycther in the Bug contest which was cool. I remember finally catching one, knowing I was going to place 1st, and I placed 3rd. A Beedrill won, I was like WTF.
Houndour/Houndoom, a demon dog? then you give it huge horns? I'm there.
Tyranitar, looks like a rock T-rex/godzilla.
Raikou, you took a sabretooth tiger and gave it electrical powers and a face mask? Wanted it.
So many more: Typholsion, Sneasel, Feraligatr, Elekid, Lugia, Steelix, Skarmory, Heracross, Donphan.
Excuse my ignorance, but what is a Christmas Umbreon? I googled it, but all I find are Umbreons wearing Santa hats.