We have updated to 3.3.8!
You will now be able to fly on your pokemon again!

You can download pixelmon 3.3.8 at:
3.3.8 pixelmon download

Alternatively you can use the technic launcher which requires less effort! All you have to do is press play for it to update. It can be found at:
Technic Pack Download
The platform URL is:
http://www.technicpack.net/api/modpack/pixelmc-pixelmon-pack