In-Depth Guide To get this avatar you have to just go to the pet lookup of a Grarrl that is painted Darigan. We have found a few and have listed them here. If you know of any more or if any of them are no longer a Darigan Grarrl please contact us via the "Report" button and we will update it as soon as possible.
The following pet names are clickable. Click them to be taken to the pet lookup. You should see a message at the top of the page saying "You are now eligible to use 'Grarrl - Darigan' as an avatar".