Hello @Vnwhisp3r,
As you have requested, I have restored your Shroomish and it should on your last PC slot. Please be more careful next time.
In the future, you can also use our Restore Pokemon Megathread for your requests about deleted Pokemon.
Now as the issue has been solved, I will locked this thread as resolved.
Don't hesitate to create another thread if you encounter a problem or want to ask any question in the future.
Kind regards,
Yverneas.