Incredibly, the move Quash is actually quite useful here as the feeling of a tremendous weight momentarily stops the rampaging Pokemon's momentum in its tracks.

...There is about a 5 second relief while everyone brings out their Pokemon to prepare before it crashes through! The gas hanging in the air momentarily obscures its face; as it slowly clears, the enemy becomes recognizable...

A wild Tyrantrum has appeared!

In that moment of recognition, a gleam can be seen running up and down its body. ...The shiny Tyrantrum attacks!

With a roar, it lunges forward, jaws gnashing, at the spot where the group currently stands.