You were running from Lavender Town into a nearby forest after someone had just run you out with one of their Pokémon, leading you further into it until you eventually reached a small clearing.

There was barely anything in the clearing: no Pokémon, bushes, berries, nothing. There were only a few fields of flowers illuminated by the moonlight. You decided this was the best possible place to recuperate and regain your bearings. As you walked through the field, you took a moment to reflect and think about your next move.

This contemplation wouldn't last long, however, as in the next few seconds, a Shiny Umbreon leaped out from one of the bushes and tackled you. It was surprisingly powerful and quickly toppled you over. It was about to maul you until it realized you were human, and it simply jumped off of you back to the bush it was hiding in, now observing you in silence, leaving you to recover from its previous attack.

You stood up and looked over at it. It didn't seem entirely hostile, but it also didn't seem to be keen on your presence either. You have an opportunity to try and capture it, or you could do something else. The choice is yours.