Me too, tho it's not as if we got to see Meowth's efforts with learning it, so I kind of felt bummed out that his Night Slash comment here was so nonchalant and wasn't foreshadowing for something major.
p96822 said:Let talk about Meowth learning Night Slash. He said that he claimed that he learned, but I think he didn't learned it yet because he was still working on it and saying it was a scary move to use. However when we look at the animation, Meowth's claws are glowing white and not the dark purple that Night Slash that it should be. Ether Meowth lie to the audience about him learning that move or the animator were lazy. Another thing that's interesting about this claim that Night Slash was just debut by Paul's Honchkrow three episodes before this one. Meowth was there watching the battle between Ash and Paul. So in my guess that after hearing about that move then Meowth might have done some research if he can do that.
Another problem I had was that Meowth said that he can't learn new moves because of his ability to speak. I don't remember that episode number, but it was something that he said. It make him think that he learn Night Slash a little bit not believable. Unless the Writers are gonna to comfrim it or not in the future.