Need to first have a companion veilwyn, then find a solwyn out in the wild. Go up to the solwyn and look at the emote above it. Command your companion to perform the emote shown until you satisfied its curiosity. Then, interact with it to receive Pristine Vulpite.

Now, with your veilwyn you will need to travel and kill Dino’s until its adventure buff reaches 100%. Then, feed the vulpite to have the veilwyn evolve