Professor Cozmo is a character in Ruby, Sapphire, Emerald, Omega Ruby, and Alpha Sapphire. He is a meteoriticist who lives in Fallarbor Town, Hoenn.
Professor Cozmo leaves either with Team MagmaREOR or Team AquaSAS for Meteor Falls, thinking that they are going to help him excavate meteors. However, the offending team steals the Meteorite, intending to use it to power their machine at Mt. Chimney. After defeating the Grunts and the team's leaderRSE, the player can take the Meteorite from the machine and return it to the Professor in exchange for TM27 (Return)RSE.
In Pokémon Omega Ruby and Alpha Sapphire proper, notes in Sea Mauville reveal that Cozmo's father, Raizoh, was a researcher for Greater Mauville Holdings and the Devon Corporation who spent nearly all his time working, apparently causing his marriage to unravel. One of the few things Raizoh had to remind him of his son was a Skitty doll the latter had sent to Sea Mauville. The retrieval of that doll proves to be the object of the Sea Mauville sidequest. Cozmo used to live in Rustboro, but at some time moved, possibly to Fallarbor.