Can someone explain IV's to me , I have read the guide on this website and I just cannot get my head around it
http://www.serebii.net/games/ivs.shtml
If you're still stuck I would reccomend reading the first 3 paragrahps, skip the math part and read the last part.
In short it's a number between 0 and 31. The higher the IV number, the higher your stat will be, they are given to a pokemon when you catch/recive/hatch them.
For example a garchomp with a 10 IV in attack, an adamant nature and 252EV's will have a final attack stat of 371.
However a Garchomp with 252 EV'S and an adamant nature that has a 31 IV in attack will have a stat of 394.
As you can see there is a difference of 23 attack points which could be there difference between a KO and a 2HKO.
To check your pokemons IV's there is a man in a blue shirt in the battle subway in nimbasa city, talk to him and he will evaluate your pokemon. he will say some phrases and then will determine your pokemons highest IV. He will say the following;
0~15 - Rather Decent
16~25 - Very Good
26~30 - Fantastic
31 - Can't Be Better
from that you can get a rough idea of what your best IV is and how big it is.