Iris should catch Chillarmy,not Belle.Ok so im guessing that bel will probably catch that chillarmy and she'll probably use her starter pokemon to do it pokabu or chaobuu and maybe one other pokemon like cheroneko or yooterri.
I guess Ash, Dento & Iris will catch new pokemon in the next three episodes:
BW 011 - Dento & Ishizimai
BW 012 - Ash & mystery egg
BW 013 - Iris & Chillarmy