I'd say Eevee would have to be the best on account of being fuzzy and absolutely adorable. It, Skitty, and Fennekin are obvious ones. But I'd also like to try holding a Starly sometime. Heck, I'd like to have a Weedle in my lap as long as it doesn't sting me. Spheal would be a great one, as even though it's two feet tall, its spherical shape would make it tons of fun to hug.
What do YOU think would be the best Pokémon to just have in your lap? --- Why do I have to move with the crowd of kids that hardly notice I'm around? I work myself to death just to fit in.