Leafy, Evs are the bar you move on smogon, not the stat itself... Perfect IVs (at level 100) add 31 to the pokemon's stat, while 252 EVs add (I forget at which level this first applies) 63 to the pokemon's stat... and then a positive nature multiplies the total by 1.1 :P
The 31 IV difference could be OHKOing that Landorus-T and leaving it with 2%HP to OHKO you :P