What is Dawn's signature pokemon?

I'm trying to fill this puzzle here and I'm stuck on a few things. The link is a href="http://advent.serebii.net/01/crossword.shtml" rel="nofollow"http://advent.serebii.net/01/crossword.s…/a in case you want to fill it in too. Basically, the question is what is Dawn's signature pokemon? I ume they are talking about the anime, but since I just play the games I don't know.