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Are there beings becoming buddhas in deva realms? - Dhamma Wheel
A Buddhist discussion forum on the Dhamma of the Theravāda
The Buddhas only arise in the human realm. Prior to their final existence, when the Bodhisattas attain all four stages of the Noble Path and became Buddhas and Arahants, the Bodhisattas reside in the Tusita deva realm.
I can't speak for the original poster, but I interpreted his question as are there beings in the Deva realms becoming Arahants/ "liberated/awakened" or whatever term you might pick. Can not any awakened being be called a Buddha, in the sense of "enlightened one"? This distinguishing a Buddha from a Sammásambuddha. I seem to recall quite a few instances in the canon where Devas etc. attain liberation upon hearing a teaching, but I could be mistaken.
If Op did did indeed mean Sammasambuddha, then consider this post null and void.
---The trouble is that you think you have time--- ---Worry is the Interest, paid in advance, on a debt you may never owe--- ---It's not what happens to you in life that is important ~ it's what you do with it ---