Demonic Bulbasaur family

Why yes. I was inspired once more.
Ahem.

Demonic pokemon seem to have some human characteristic, such as the feet here and chests. It's pretty easy to distinguish a demon from a normal pokemon, since they are up to 50% larger than their normal counterparts. They are also more intelligent, often able to speak even without telepathy or tricks. Of course it's pretty rare to see a demon in nature - 99% of the time they are either summoned or a gijinka turns into one, rationalizing their ability to speak very easily. Most people don't even realize these beings could exist outside of these cases.

(and yeah you can't catch a demon or a gijinka in a pokeball - they are stronger than normal pokemon and are able to break out easier. Same goes for normal legendaries, actually. People just can't catch them. 'w')

Bulbasaurs are herbivores, and fairly docile. They move with an awkward waddle that is something in between a puppy and a toad.