avr |
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You can get one as a familiar - there's a couple of druid domains which give you familiars, then take the improved familiar feat at level 7. Or you can take a rather poor archetype, the draconic druid and get a drake companion, which could be made into something sort of like a faerie dragon.
CBDunkerson |
There isn't an option for this in the existing rules, so you're looking at a house rule situation and it is really a question for your GM.
That said, there have been versions of the Faerie Dragon (including the original Pathfinder 'bestiary preview' I believe) which included spellcasting progression (and changing scale colors) tables that might be adaptable to something similar to animal companion progression.