Quite simply, what do you think will be good leads in Gen. 5?
One I thought of was Gigaiasu.
Gigaiasu @ Lum Berry
252 HP, 252 Att, 6 Spd
Of course, just theorymon. Just chose this because it looked similar to a Gen. 4 lead
Gigaiasu has very nice HP, Att, and Def, and access to Stealth Rock (no longer a TM, but still able to be transferred from gen. 4 Pokemon iirc) and Explosion. It also gets nice coverage coming from EdgeQuake, and the ability Sturdy as a free Focus Sash, allowing it to run another item.