There's something about grumpy things that just makes you love them. I don't normally go for Pikachu, but I'm quite partial to a grumpy Pika, and I adore my large angry Pikachu plush. As for Shroomish, well, it was a no-brainer. Shroomish is one of my side collections, but I do love the grumpy mushroom, and the occasional piece of happy merch is pretty exciting!
There are no official Shroomish plush :( I'm expecting a custom or two soon, though... hehehe >:D