You are probably talking about Terrakion's cave in Victory road. There is also an area in Pinwheel forest blocked by a tree that leads to the legendary Virizion. To remove both of these impedements you must find Cobalion first.
Go to Route 6, just north of the Deerling lab. Surf East on the water to the Mistralton Cave. On the top floor is Cobalion. Defeat or catch him and the blockades to Terrakion's Cave and Virizion's Grove are removed.
You'll need to beat the Elite Four and obtain the National Dex in order to get through.
Have one of your Pokemon use strength
You Cant But The side Boulders Like This ^ You Can Hop It
To get past the boulders you have to let one of your Pokemon to learn the move strength.
just push all the boulders
make one of your pokemon learn the hm strength
go to drakebreathe city enter the cave and you will fight lance defeat him and he give you the orange pass finish all pokemon league first
you can find it on tanoby chambers but first you have to pull the boulders by using straight in tanoby key You need to defeat the Pokemon League and have the Rainbow pass to gain acess to this location. it is on one of the 7 islands
It takes time but figure it out.... push the boulders
First, you have to get the HM strength, then teach it to and a Pokemon and you can move boulders.
you cant
The Pokemon League is in Ever Grande City, but before you can reach it you have to pass Victory Road.
You Cant But The side Boulders Like This ^ You Can Hop It
those are boulders that have to be pushed around by using strength
if your talking about the Pokemon league beat them and go on the snowpoint boat hope this helps pokefans
u have to beat the elite four, and than ur rival
move the boulders to where the lake Pokemon are
You get the hm strength and give it to one of your pokemon
To move boulders in Pokemon Gold you need a Pokemon with the HM move Strength. Selecting the Pokemon in the menu outside of battle should let you use it if you have beaten the Olivine City Gym.