Yes, I’ve seen this earlier than. It’s a bug. That is the animation of a health club underneath assault, regardless of there being no health club on the heart of it.
I’m undecided in case you obtained this the identical manner as me, however I ceaselessly get this visible bug once I test on one in every of my Pokémon that’s at present defending a faraway health club (one that isn’t inside vary of me however that I can test on remotely) that’s being attacked. The sport (for some cause) strikes the map to the place the health club really is when you view the health club display screen and if it’s underneath assault, the preventing dustcloud might be rendered as nicely. Occasionally once I shut out of the health club display screen, the dustcloud continues to rage on. Opening and shutting menus does nothing for me when this occurs, I simply shut and restart the app, and all the pieces is mounted.