>>35449161This, Pokken has warped people's perceptions of it. Decidueye is supposed to be quick on the draw, able to lock and loose an arrow in the blink of an eye, but it's not a very fast Pokémon.
It losing its shit if it gets surprised is canon as well; it's in the Dex entries. It's based on a sniper, soldiers that don't really move and are fucked if someone gets the jump on them.