I know that mine was kind of a struggle, but here I go:
• Kanto - Persian, I love cats and Persian of course (at least for me) is the top Kanto partner
• Johto - Furret, out of all the Pokemon available in Johto, Furret is the only one that I sort of like, all others, not too excited about
• Hoenn - I have three I like, the one I like the most would be Delcatty. I also like Zangoose and Linoone. Delcatty more mainly because is based on a cat
• Sinnoh - Glameow, another cat as my favorite, but I also like Luxio and Buizel.
• Unova - Watchog, I'm really loving this half prairie dog/half weasel a lot more.... it's slowly taking over all over my brain, and heart.... I also have to mention Liepard too as one of my favorites.
• 6th Generation - out of the 5 Pokemon introduced, I'm liking Chespin the most.