>>16301139Maximum IVs per stat is 31 and it raises that stat 31 points (unlike EVs that raise stat by 1 per 4EVs).
Here's a good guide fro breeding in X and Y:
http://nuggetbridge.com/breeding/breeding-perfect-pokemon-x-y/Tamashii's video tutorial is very straight-forward and simple to understand:
http://www.youtube.com/watch?v=b-NnwzMKMx0