Bulbasaur and Chikorita are not reptilian. How about the first starter whos main coloring isn't of the type they are? Thats why I don't like Chespen, it just doesn't look like a starter. But still cool.
Pre-Smash we had Pokemon Sunday, which was the Gen 4 equivalent. I forget if they announced Platinum there, but they definitely did for HGSS. A better wording would be "First to not be announced on Pokemon's television show about the game" but even then I'm pretty sure they didn't have anything of the sort for the earlier games.