Shiny Dratini is availible in Pokemon Go now.

Also there's an event tomorrow (11-2 PST) where a bunch of Dratini will be spawning with what is believed to be an increased shiny rate.

I only mention this because it looks fucking adorable.

http://puu.sh/zupIB/a71059ab53.jpg

My friend caught one on his 3rd Dratini.