In Pokemon 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 Vor and it was in Japanese, so i looked up the answer for Du XD anyway... After Du beat Saturn at Lake Valor Du have to go to Twinleaf town and go up to Lake Verity. When Du get there Du will have to go through two team battles. Then Du will battle Mars. Now Du have to go to Eterna City oder Celestic Town and enter Mt. Coronet. Now Du head up to Snowpoint City. hope this helps although i think Du already figured what to do :P