It is possible to have a high level shadow peashooter already because EA briefly put seed packets in the modern day pinatas but only in the streak pinatas and i managed to get mine up to L6 before they removed them. Because of the streak multiplyer someone with a massively long streak could have got a huge pile of seed packets. At the moment they are only available through the store at a ridiculous gem price or in the pinata parties at 3 per pinata (if you're lucky).
That's what i understand to be the case at the moment.
I lost by over 10 million to a maxed out bot and i posted a screenshot on another post.