Beautiful cards, mate!
On Silvally, isn't the point of Colorless Energy that you can use any type? I like what you were going for, but I'm pretty sure you could just use Colorless Energy for the attacks and it would mean the same thing. The wording doesn't sound correct, but I don't know the newer cards very well, so I could be mistaken. I'd look at something similar to Kecleon from Plasma Freeze.
Since attacks deal damage based on the Pokémon's type (and not the attack itself), Multi Attack doesn't really need the description, since you intended for Silvally's type to change as well.
Also, be sure to always capitalize Pokémon (it's lowercase in RKS System).
One thing to keep in mind, though, is not to cover up the Illustrator credit. Seems you did so (pretty blatantly) on quite a few of them -- proper crediting is a must.