Watch this On the last turn, (they forfieted) for some reason Grassy Glide doesn't target Amounguss after it uses Rage Powder. Why is that?
Grass-type Pokémon, Pokémon with Overcoat, Stalwart, Propeller Tail, and Pokémon holding the Safety Goggles are now immune to Rage Powder, such that their attacks are not diverted by it.
Source
Rillaboom is Grass type, so it was not affected by Rage Powder.
Hope I helped!
