As much as I'd like some of their stats change, I highly doubt the will because of the position they're in. If someone wanted to fight a D/P Sceptile in your case, with their R/S/E Sceptile, the D/P Sceptile would win for its extra defense. They stats should stay the same, until they have a new group of the Pokemon games. They so far, as I see, have a pattern with R/B/Y able to link to G/S/C, Stadium, and Stadium 2. While R/S/E link to Colluseum, XD, and D/P. D/P can link to R/S/E and Pokemon Battle Revolution from what I've heard. So no, there shouldn't be stat changes until another time. This isn't the time for stat changes to happen.