Interesting question came up today to which I do not know positively the answer so hoped someone else might.

If you put an angelic pet in the Adoption center does it change in to a common pet like hydrus pets do?

No, I've seen and adopted several angelic pets from the pound - they stay the same. 😊

only Hydrus pets, bumbus and bhakorus turn into something else in the adoption center

- I thought that was the case. Thank you for the comfirmation guys ^_^