I am desperately trying to find a new mod to help with PAD, since right now the stupidity/mods ratio is decidedly tilted towards stupidity. Beyond that, I'm doing what I can and trying not to ban half of PAD while doing it.
Piplup is not popular enough outside of Pokemon to break into Brawl. Pikachu is mainstream popular, the PKM trainer is their for a nostalgia R/B/Y fix, and so no starter outshines the other. Jiggly's still popular, and Lucario>Mewtwo now a days.
And like I said, no starter will outshine the other, that's why Blaziken wasn't in Brawl/Melee, and he was pretty popular.