^ Scarf Manectric hits 258 Spe, so you can get away with 129.
but you're basically right, it is a bit pointless to run any more
speed than that.
Kerech is right about IV breeding, it can be a very long and
tedious task. It usually takes me a couple of weeks to get the
IV's I need, and even then you may have to sacrifice and take
a horrible IV in another stat. Sometimes you can get lucky and
the randomly generated stat will come out >25, but that's rare.
IMO, it's totally worth the time if you're serious about the BS,
but if you're boosting Spe and you can outspeed your fastest
threat without a perfect IV, a perfect IV is not worth the time.