No, you have 508 stats. If you max out (say) Attack and Speed (being 252 each, 504 total), you have 4 stats left. So that means you can have 4 Defence.
Thats a completed pokemon, so you cannot max out another stat (or be close to maxing out another stat). "Thats all you get, jerks!"-Bender, the shiny-butt robot. XD