Welcome, have a great time here!
I have 2 Friend codes I use about equally. One is 4055-3723-1345 and the other is 0576 3520 6954. I'll try to mention which one to look for when needed, if I don't then ask.
I try to train pokemon with the best natures and IVs, but generally don't breed for IVs and occasionally use a pokemon that could have a better nature out of laziness (on the other hand I have reset or recaught the same species 20+ times to get the best nature and decent IVs sometimes). I somewhat do EV training, but don't calculate it out so it's perfect, just rely on the chart in the super training thing.