If you're thinking about making a balanced offense team in OU, I'd seriously reconsider. Stall runs the OU metagame. Most of the top players on the PO server (currently PO OU tier is the same as Smogon OU, with the exception of Excadrill being allowed on PO and not Smogon) run heavy stall. I myself rank pretty high on the PO OU ladder (1500s), and I can tell you that you'll be at a serious disadvantage with a balanced offensive team. Honestly, I think even a badly put together anti-stall team would fare better than a well-thought-out balanced offense. I've also never done anything but laugh at opposing Terrakion when I've used stall.
And I've got your Friend Code in, and made a clone of each of the Mews (one is nicknamed "Mew", the other is unnicknamed) so there's 4 altogether. All of them are tutored Softboiled, Seismic Toss, Counter, and Mimic.