I think your luck is just truly dogwater. I'm sorry - that sucks so bad!!!
I am increasing all of the rare encounter odds next update (no more 1% encounters, min will be 2%), and I'll take a quadruple check into those raid dens to make sure that everything is working properly. We did have a guy encounter a Carnivine live on stream in the discord though the other day, so I have seen it with my own two eyes on a save file that isn't mine!