Latias! She's cute, she's got a great design - telepathic light-manipulating jetplane-dragon, what part of that description is not awesome? - and she rips metagames apart without trying. Also, red is my favourite colour |3 Currently I have a Latias called River (after Tam, although Song works too) on my forever team on White; she doesn't fight, but the field moves she learns happen to perfectly complement those of my beloved shiny Linoone... and her cry sounds nicer than her brother's, which stops being a minor thing when you have to listen to it every time you use Fly.
Back when Gen III came out and my favourite colour was blue instead, I liked Latios more (and he's sort of the underdog, IIRC?). He's still very much up there. Wish I had a decent one for the Battle Subway.
Day 2 - Your least favourite Pokemon
Day 3 - Favorite starter Pokemon
Day 4 - Favorite Eeveelution
Day 5 - Favorite legendary Pokemon
Day 6 - Most terrifying Pokemon
Day 7 - Most adorable Pokemon
Day 8 - Most amusing Pokemon
Day 9 - Favorite Pokemon type
Day 10 - Least favorite Pokemon type
Day 11 - Favorite new Pokemon from Black & White
Day 12 - Favorite Pokemon attack or move
Day 13 - If you lived in the Pokemon world, what would you be?
Day 14 - If you were a gym leader, what would be your specialty?
Day 15 - Favorite region in the Pokemon world
Day 16 - If you could live anywhere in the Pokemon world, where would it be?
Day 17 - If you could be any Pokemon, what would you be?
Day 18 - Favorite Gym Leader
Day 19 - Favorite Elite 4 member/Champion
Day 20 - Favorite Pokemon Professor
Day 21 - Favorite Pokemon bad guys
Day 22 - Favorite Rival
Day 23 - A Pokemon which reminds you of a friend
Day 24 - A Pokemon you’d find useful in real-life
Day 25 - A Pokemon based on your favorite animal
Day 26 - A Pokemon that is your favorite colour
Day 27 - Favorite Pokemon game
Day 28 - What did you nickname your rival?
Day 29 - Favorite Pokemon tune or song
Day 30 - Most nostalgic element of Pokemon