leave there. after you have caught dialga, that's when the guard will disapear. though the entrance only leads to a shortcut and nothing more important.
there is another entrance on the left
To get to the top of Mt. Cornet you have to beat the team Galactic Eterna City and Veilstone buildings(otherwise there will be a cave painting blocking the path in Mt. Cornet) and enter Mt. Cornet from the Oreburg-Hearthrome City entrance(This is the ONLY entrance to the summit of Mt. Cornet. The other entrance takes you on the path to Snowpoint City). You need the HMs Rock Climb, Rock Smash, Strength, and Surf (Defog won't work in the cave). Also, when you get to the crumbled cave painting, Looker will give you a Black Flute, which lowers the chance of you running into wild pokemon.
He's not blocking the way. The boss is in Spear Pillar at the top of Mt. Cornet.
action replay no, by capurating the legendery Pokemon on top of Mt. Cornet. then the person will stop getting in your way.
Make sure you battled Cyrus and freed the Lake Pokemon. Go to Mt. Cornet through the Orebrough entrance. When you get to a room with a couple bridges, go through the newly made cave entrance. When you get to the outside of Mt. Cornet you're almost there! When you get through it you'll be at a place called Spear Pillars and the rest you'll figure out.
theres one on a cliff in the survival zone on battle island and theres one in mt cornet (go in from the orberg entrance)
you need to capture/kill palkia/dialga at mt cornet and go to team galactic base in veilstone city
its on the top of mt cornet.
to the north and then you go right
mt. cornet
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mt. cornet