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There are many guides, and I believe calculators that can help you with that. As for Hidden Power Breeding, I use this:
http://www.metalkid.info/Pokemon/Calculators/HiddenPower.aspx
I agree with atsync. Rock Slide is not as useful as HP Rock, I don't think there is anything that it beats HP Rock in for your Charizard's EV Spread. However, you might have to rebreed to get the proper IVs...
Anyone know any good bulky physical sweepers? They can be slow, since I'm abusing Blaziken's Speed Boost, and crippling pokemon with Whimsicott.
EDIT: Right now I'm using Blaziken to +2~6 Attack, as well as speed until he can BP to Garchomp. Garchomp doesn't survive as many hits as I'd like him...
How do you guys have the mental focus to not get pissed when your chain breaks before you even get to 30 -.- . Mine always breaks before i can get a shiny pokemon, so remember kids a dead Kricketune helps stop global warming!