Regirock is not in Mt. Coronet, but on the route above Resort Area, the route with the sandstorm in it. It is reached with the bike and it's entrance is very hard to see within the storm......but you...
yes and you need surf, defog, strength, rock smash but when you use rock climb it doesn't take you to spear pillar it only goes up like the other ones. Also you need your Pokemon healed to get to...