In Pokémon Platinum, how do I get past the two Galactic Grunts guarding the passageway to Snowpoint City?

i don't remember much from the game cause i played it long time ago and it was in Japanese, so i looked up the answer for you XD anyway... After you beat Saturn at Lake Valor you have to go to Twinleaf town and go up to Lake Verity. When you get there you will have to go through two team battles. Then you will battle Mars. Now you have to go to Eterna City or Celestic Town and enter Mt. Coronet. Now you head up to Snowpoint City. hope this helps although i think you already figured what to do :P