lolgames4u beat me to it, but I'm still going for it.
Ghost pokemon have always been some of my favourite pokemon. They are interesting in design, though they have dark origins, being dead and all. I don't like them for battle capabilites, though they can be useful, I like them because their entire atmosphere appeals to me. Haunter Stand as my favourite because it's design is interesting, and it's personality is usually playful.
If you know me, you'd know that foxes are my favourite animals. Ninetails is based on a kitsune, a fox spirit. But 2 and 2 together and Ninetails makes this list, based simply on appearance and it's type, fire.
I'm not normally fond of fighting-type pokemon, but Blaziken has a certain appeal that I can't not love. It just looks cool in general, and in battle, it's pretty good. Torchic was my first starter in Sapphire, and I don't regret it one bit.
Psychic type. Alice. Enough said.
But seriously, telekinesis has always interested me, and since Alakazam is a pschokinetic manipulative being, it was bound to make my top 10 list.
(it deserved an awesome picture)
Gardevoir has a radiant appeal that i really enjoy, not to mention it is a psychic type. Ever since Sapphire, Gardevoir has remained my favourite pokemon. It's appearance, type, and essentially everything about it are enough to get it to number 1 on Alice's list.