After not playing any Pokemon game for many years, I decided to give Sword a try. Early on, I was messing around with the "surprise trade" feature and got a level 100 Tapu Bulu in exchange for a level 10 Shellder. I didn't even know what it was until I looked it up. My question is: Why would someone trade away something like that at random? Is that sort of thing common with surprise trade, or did I just get lucky?