Electric first, Rock second.
Electric is difficult to stereotype since latest generations, however I feel they still have a bigger stereotype than about any other except like Steel and Rock, making it a good choice for this CAP. Most, but not all, are fast, the exceptions being Magnezone, Ampharos and Lanturn. Everything else seems to be all Raikou, Manectric, Raichu, Zapdos, Electabuzz, Electivire, Plusle, Minun, Pikachu, Electrode, yadda yadda. Many of them have killer offense, most of them through the Special way, though some are decidedly average.
Not trying to polljump here, just trying to see what is defined as the mold to be broken.
Rock
If there's a polar opposite to Electric, it's this. There's no fast Rock Pokemon besides Aerodactyl (you might be able to count Kabutops), and they are pretty much all physical...the only real special attackers among them are, from the top of my head, Omastar (who plays more as a Water type offense wise at any rate) and Probopass (whose offense can hardly be considered anything to write home about).
Add that Togekiss and other fliers still give all CAPs a run for their money (even Fidgit is not an adequate answer - didn't I read most of them rely on Earth Power as their only attack?) and I think we can conclude one of above types is needed.