Ok, wow, school makes you miss a lot of things. On that topic, holidays are over, so that narrows the time each day in which I can read/respond considerably, since I not only have to sleep now, my school day is about ten hours including travel.

I'll post now (planning to last night, but sleep).

Tl;dr post summary: Shannon wanders slightly, stumbles, uses Growl (Hyper Cutter Mawile immune), Intimidate Mawile uses Fairy Wind, Shannon uses Powder Snow.

I interpret dungeon Pokemon as frightened xenophobes with poor understanding of the 'common' Pokemon language, personally, but whatever headcanon fits.