the boulders are more stronger than weak rocks.
you can use the hm strength you can smash rocks with rock smash
you must get the hm rock smash, if the bolders are a redish-brown with cracks then you can smash the rocks
You must learn rock smash. You get that from a man standing in the right of you you when you have beaten sudowoodo
In Pokémon Ash's quest, you can use Rock Smash in various locations, primarily in caves and areas with boulders blocking paths. One notable location is in the Hoenn region, where players encounter boulders in the Rusturf Tunnel that require Rock Smash to clear. Additionally, certain gyms and routes may also feature boulders that can be broken with this move. Remember to have a Pokémon that knows Rock Smash in your party to utilize it effectively.
To move the boulders and clear a path. If there are two types of boulders in your version the boulders with cracks need to have rock smash used on them instead of strenght.
You need to teach the HM strength to a pokemon.
Use strength or use rock smash.
In granite cave, use rock smash on the boulders until they appear.
you go to the cerulean cave and then you use rock smash on huge boulders in kanto
See dude all u got to do is train your Pokemon beat the 1st gym and the badge after that go to the cave to the left of the city and talk to the guy in the tracker suit he will give u a HM 01 Rock smash teach it to a Pokemon and go to the cracked boulders press the A button and say yes then.......poof the boulder is smashed
you cant
go to VERDANTURF TOWN , go into the cave used 'rock smash' on the rock and u will get strength , the TM u want