IV = either
Generation IV, as in Diamond/Pearl/Platinum OR (and this is the funny part)
Individual Value, that comes with the Pokemon the moment you get it. They go from 0 to 31, and determines how good that stat will be. (I.E, a lvl 100 Infernape w/ 31 IVs in Special attack will have 31 more stat points than an otherwise identical ape with 0 IVs.)
This is rather important when it comes to competitive battling, as the quote is taken from a thread where someone asked what IV's are. (for the purpose of battling, that is)
And when he got redirected to a gen IV thread... I found it rather funny :P