One thing to remember is that simply maxing out two stats is often a waste in Little Cup. After investing heavily in two stats you can often get free points in others, for example a Steelix (why would you use that anyway???) with 252 Atk / 252 Spe would have 21/16/12/9/11/15, while a player who made a more careful spread of 236 Atk / 12 Def / 252 would end up with 21/16/13/9/11/15. The extra defense point may not look like much, but it means that Steelix will take Physical hits 8% better.
80 EVs = 1 Stat point
1 Base stat Point = 8 EVs
1 IV = 4 EVs
SOURCE: Smogon (http://www.smogon.com/dp/articles/little_cup_guide#EVs) and then just scroll down, or click on ev distribution