Originally Posted by Fat LouisCyphre
If you come in on rocks, you'll only have 303 HP, which does not score nearly as many kills with Death Gambit. In addition; running it as a lead is just asking for the enemy to use Protect to either scout your move, or (should it indeed work that way) cause Death Gambit to be wasted.
Aside: I can't stop picturing Victini with a Goatee now. :(
Obviously you have to scout with U-turn first, using Death Gamble off the bat is not a wise move.