I see what you mean but Mismagius does OHKO Mega Mewtwo Y with a DCE and Cosmog attack is to remove things like Coil, Stardust, etc.Grammar Attack is hilarious, I wonder how good that would be competitively. Probably not that good.
For Cosmog's Super Smog attack, instead of Defending Pokémon I think it would be just "This Pokémon." I think the second half of the sentence would read "remove all effects of attacks on this Pokémon."