Oh yeah I remember that. It was revealed alongside Sharpedo (another example) and Shroomish.
Yeah, Drapion wasn't silhouetted, Blaziken I can't remember, but I'm pretty positive that Lucario was. I kinda rememeber ppl speculating what it was.
It's not really another example because it's not what I meant...
Anyway, Blaziken just showed up in the anime IIRC. However, you're right on Lucario-- I seem to remember it being silhouetted before showing up as the main Pokemon in the movie, like Zoroark. Normally I would consider it an exception, considering like I said, it was a main Pokemon in the movie that for whatever reason didn't include Riolu, but they showed Zoroark along with Zorua. But THEN AGAIN they were BOTH main character in THEIR movie. I'd like to say they're all an exception, but...
BUT, no exceptions, I'm wrong, but suffice to say this probably isn't going to be an evolved form of a new Pokemon (and probably not one of an old Pokemon either).