As for your Substitute question, it fades if a move that would do more than 25% damage, since Sub uses up 1/4th of your health. The reason why I suggested it on CM Chandelure is this: you can bring Chandelure in against something it can counter easily; while the opponent switches, you set up Substitute, and you can grab a free Calm Mind regardless of whether or not the opponent attacks.
You don't IV train; you EV train. You breed for IVs.
http://www.serebii.net/games/evs.shtml. Here's the basic EV guide and the places where you can train for the EVs you need. In older games, you can use the EV-reducing berries to get your EVs to 0, then re-do your EV training from there. However, those berries aren't available in B/W, only in the Dream World. So yeah, you might have to do some re-breeding.