The Pokedex data is fetched from Pokemon Showdown's public API, I'm not sure why some of the pokemon have negative numbers like that but if you take a look in the Pokedex there are a good few of them ->
Pokedex
I just figured that's how they are in the actual games, never really verified it myself. If I can find out their correct numbers I can modify our fetcher script to submit the correct values, but it does make me wonder why Showdown would have incorrect values like that.
As for the descriptions, blame
@CommonTravelGuy >_>
I don't think I'll outright remove these made up pokemon from our Dex, as I plan down the road for it to be a useful resource for Showdown tournaments, but I think it is a good idea to stop them from appearing as the PoTD.