Oh, an Oricorio. They are pretty interesting little birds. Did you know they can change their appearance and the way they dance based on what they eat?

[Greg is new, so Armin feels pointing out cool little pokemon facts is helpful.]

Well.

[Oh no, Greg. You've done it. You've unleashed The Nerd.]

I have to admit I don't quite know how to works on a molecular or genetic level as it seems there is still a lot of pending research in those areas --

[But, let me tell you, Armin is privately very proud that he now knows concepts like Genetics and Molecules. None of this stuff is known back home. If only he could tell Hange about it all.]

but, in essence, all though Oricorio doesn't evolve, it does have four different so-called forms or styles. They can switch freely between the forms on consuming a certain type of nectar. And when they do, not only does their appearance and dance style change, so does their typing.

For example, the form you have right now is called the Sensu form. In addition to flying, its typing is Ghost. Supposedly, through their refined way of dancing, they are able to communicate with the spirits of the deceased. Admittedly, that part might be more superstition than fact, but I don't think anyone can deny its elegance. I own one myself, and she's a very proud pokemon. I don't think I've ever seen her with any feather out of place.

If Tiny Dancer were to consume the nectar of a certain type of red flower, he'd change into a Baile form Oricorio. These are extremely passionate, both in spirit and dancing, which might be a result of their new Fire typing. My Noctowl's mate was a Baily style Oricorio, and let me tell you, though she was small, she had ways of making sure everybody knew exactly what she wanted.

Upon consuming nectar of a related type of pink flower, he'd transform into a Pa'u style oricorio which has a psychic typing. Apparently, their style of dancing involves more swaying, gentle elements. Unfortunately, I don't have any personal experience with this style, so I don't know as much about it as the others.

Finally, if he'd consume the nectar of the yellow flower, he'd transform into an electric from known as the Pom-pom style Oricorio. They generate electricity by rubbing their feathers together energetically. This form is characterised by its high-energy, pumped-up style of dancing. It's said they really don't like seeing people sad and they will dance for them until they are cheerful again. Though, uh, I know some of them do have a tendency to deliver one of their electric punches if people don't cheer up quick enough, but that's more of a personal disposition thing than a species-wide thing.

Each form is called after the different islands they were first discovered on. From what I can tell, these islands are fairly similar, but they do have unique elements which led Oricorio to adapt in this way.

I don't think you can buy it in stores. You'd have to travel to a different location. Usually, the best way to find them is to check if a certain form of Oricorio lives in a particular area. If they do, then the flowers must be present too.