Mine are my signature already - the PokeCats (all of them, especially Persian and Liepard) - Buizel, Floatzel, Dewott, and not too long ago (about 4 months or so) fell in love with Watchog.
(edit - to add a short reasoning) For starters, I love cats in real life, so all my favorite Pokemon are based on cats thats why I love Persian and Liepard first. Reading some of the Pokedex entries for Persian, it sort of reminds me of the personality for one of my real-life cats. I also love Liepard's fur markings.
Not sure why I specifically like Dewott, just love the design of it.
Aside from cats, I also like mustelid-like animals (ferrets, meerkats, otters, weasels) so any Pokemon resembling or based on mustelids I'm also starting to like. Buizel and Floatzel are slightly based on River Otters and in my opinion Watchog's head resembles a prairie dog, with a Meerkat like appearance (the way is stands) and a slightly overweight weasel like body.