Agreed, Gotian. Some people's theme relies largely on the rules (Eg. yours and Serenade SPs), whereas some people's theme relies on the pokemon in their team (Eg. Mine and Pirates), so I'm for unthemed to make it more even.
Registering 12 Sounds like a great idea, and I'm assuming Standard Rules = No Ubers. Leastways, I hope its no Ubers.
Zog
Ps. Nah, keep your bad luck, its much easier
EDIT: Let me elaborate on no themes, PWG. Example of me vs you. My theme is pretty simple - I use pokes fitting the theme of "Dragons in Disguise". But you have 2 different teams (one of which is unthemed as a team), so I'd have to fight and beat both, without Choice Items, to win? Or just one? Sleep Clause, or no Sleep Clause? Who's rules would take priority? Would your rule of "No-one can use Crobat, Ninjask or Yanmega" override my rule of "No-one can use Infernape"? What if one of those was on one of our themed teams? Logically, it just wouldn't work unless we all had to submit a themed team, which some people don't have as their theme is in rules. Furthermore, I know I for one don't have 12 Dragons in Disguise. I have trained a team of 6, because logically, I'd not ever, really need to use more. Hell, I'd be hard put to think of 12 potentials!