"Hey. I think I have one of your Pokémon. A Chat--be quiet--Chatot?" The 'be quiet' is obviously to the bird, not Neku.

"He was pretending to be you earlier, so I thought he might be yours," he adds, in case Neku can hear it over the squawks. Hopefully Twister won't get himself tangled up in Luke's hair with all that moving around.