Focus Band is poopy because it relys on luck. >_> When you go to the Battle Tower, use Lum Berry.
I'd rebreed so you can get a Modest one with Ice Punch and Thunderpunch. =/
Calm Mind > Reflect, but don't waste your one Calm Mind TM on a bad Natured, non-EV trained Kadabra. Training should go a lot smoother once you beat the Elite Four.
EV Training isn't all that hard, but there's almost nowhere to do it in Hoenn.

If you ever get FR/LG, you can EV train easily there.