But I don't know about thaaaat....
Did you seriously dig an e-reader era card to try and counter my theory?
Most grass neutral pokemon these days have electric weakness. Ludicolo, Mantine, about 90% of Kingdra versions (with the only exception I know of being BUS Kingdra), the Empoleon line, etc.
The only consistent exception are Grass/Bug pokemon, and apparently grass/poison in the sm era (Tentacruel was lightning weak until SM made it grass weak).
Also, as revealed by TPCi press release back in June, Sobble has tears as potent as 100 onions.
Final stage is going to be Water/Poison, I can bet on it.