Piplup being a Pokeball Pokemon has practically confirmed that they're officially adding both 3rd and 4th Generation Pokemon in Brawl. That's good because I was kind of worried that they wouldn't add Pearl and Diamond Pokemon even with those games being released before Brawl did.

The Smash Bros. series always had a habit of skipping a Pokemon generation (having no Johto Pokemon in the N64 Version but having a Pokemon game with Johto Pokemon also on the N64, having no Hoenn Pokemon in the Gamecube version but having Hoenn Pokemon in a Pokemon Game also on the Gamecube). I know Nintendo can't really help doing that but I'm glad they didn't do that for Brawl (having no Sinnoh Pokemon on the Wii Version despite having a Pokemon game on the Wii with Sinnoh Pokemon).

As for Snake, I was against him being in Brawl from the beginning. I guess as long as Brawl is still more Nintendo than anything else (Konami, Namco, Square-Enix, etc.) I guess it should be okay.