: The franchise uses a wide array of specialized sound effects, ranging from "Anime Big Pop" sounds to modified animal roars (like bears and lions) to give creatures their unique identity.
Regarding your request for a paper, researchers have actually studied the franchise extensively through a subfield called , which explores the relationship between sounds and character traits. The Role of Sound in Pokémon (Research Summary)
For more in-depth reading, you can access the full paper Sound Symbolic Patterns in Pokémon Names by Shigeto Kawahara, which details how phonetic properties correlate with Pokémon attributes.