Originally Posted by Fat Biosci
In beginners cup iirc, the two fastest will be Crobat and Jolteon who both Speed tie. It might be work taking the EVs out of Speed or even take them out of Attack for some extra bulk, but you would really have to know what you wanna live.
For example in VGC 2012, I used Adamant with 24 HP EVs and enough Speed EVs to outspeed genies and the extra EVs let me live Adamant max Attack Heracross's Stone Edge.
Accelgor says hi :P Though I doubt it'll see much use.
You may want to invest enough Speed to beat Tornadus-T (depending on how the rest of your team does with it), which would require Jolly. Otherwise, there isn't much to worry about above the Incarnate genies and then the musketeers.