EV's are invisible points that pokemon give out when you catch or beat them.
( which EV's it gives depends on the pokemon, they can give either, HP, Atk, Def, Sp. Atk, Sp. Def, or Speed. )
IV's as invisible numbers on each pokemon that determinate how high a stat is able to go.
( they range from 0 to 31, 0 it has absolutely no potential, with 31 it's the best )
Bold on a Palkia is not that great to be honest.
and being at Lv. 5 i can't really tell if it will be good or not.
( there is this ace trainer in the pokemon center in the battle resort that can tell you the IV's )
( in X/Y it's an ace trainer in the pokemon center in kiloude city )
that can tell you what's its IV's are