You must learn a special skill to tame Lesser Dragonkin. For pets of this family other than cloud serpents, the skill is taught by the tome, How to Train a Dragonkin. This is awarded by Kaestrasz in Valdrakken at renown level 23 with the Valdrakken Accord. It is only awarded to hunter characters with the appropriate renown, you cannot achieve the renown on a non-hunter alt.
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Location & Notes:
Located in The Emerald Dream. This fey darter can spawn during Superbloom events when someone chooses the ability Fae Lens from a dreamfruit. This ability isn't offered every Superbloom. You may have trouble taming one of these darters before someone kills it, but it's also not a unique colour.