Giving him away was rather hard, because (even though I don't really play Pokemon) I think Squirtle is too cute to handle and he's one of my favorites.
The pattern (http://wolfdreamer-oth.blogspot.com/2009/05/squirtle.html) was great, but I would recommend using a G hook instead of an F for a slightly bigger toy. He's pretty small.
I used Red Heart Super Saver yarn for the body of the work, and Red Heart crochet thread for the embroidery.
Pokemon and Squirtle are copyright Nintendo. And the pattern is not mine, follow the link above.