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Just a warning, you will want to douse yourself with gasoline before you finish EV training your Pokemon. Breeding for good/perfect IVs is probably even worse especially since the reward is not as great. I wouldn't know because I got bored of the game before getting obsessed enough to attempt breeding for good IVs.
The simplest advice I can give is to not have gaping Weavile/Heracross/Azelf/Gyarados weakness. This is much more difficult than it may seem. This game does not really reward vivid imagination, using cookie cutter Pokemon in such a way as to exploit the metagame is the way to go.