I've been on a Colosseum/XD kick lately (mainly involving transferring all my Shadow Pokémon to my gen V games) and I wanted to know: what is your favourite Shadow Pokémon, and why?
For me personally, I'd have to say it's Shadow Scyther. This is partly due to personal bias; Scyther is one of my favourite Pokémon, and I was incredibly excited to catch one in XD. Even better, this Scyther has one of the most random XD-only attacks ever - Morning Sun! Who would ever think to give a Scyther Morning Sun?! (Someone awesome, obviously.)
I also rather like Colo's Metagross, and XD's Exeggutor is serving me well in White 2. And of course, one can't have a thread like this without mentioning XD001. <3
What about you?