"Hm?" Chuck asked, looking behind him to see Cosmo peeking out.  When Chuck sees him, Cosmo smiles and calls out "Cos!"  Chuck sighed and said "I guess you can come on out Cosmo, guess I can't keep you hidden."  "Cos!" Cosmo calls out again, hopping out of the bag.  "This is Cosmo, apparently it's a Cosmog, and may be an Ultra Beast.  I found it at the Aether Foundation before Nihilego appeared.  He was being chased by a couple of the Aether Foundation members, so I suggested he hide in my bag and come with me.  I figured something might have been going on, so I decided to keep him hidden."