If you are talking about the cave painting in Mt. Coronet, you cannot break it down. Team Galactic will take care of that after you defeat them in their HQ: Veilstone City.
Beat the game first, then go to the Kanto Region, and then there is a cave in the city where a guy was blocking it earlier, but now since you beat the game you can go into the cave and find Mewtwo.
In which game?
It depends what game. In Pokemon games you either use the Poke Flute or the radio in your Poke Gear. Snorlax is usually outside of a cave or blocking a path.
Pokemon Emerald is a role playing game for the Game Boy Advance. There is no such location as the Entora Cave.
beat the game and if you did beat the game go into the cave and you will find mew and mewtwo but you can only go into the cave when you have all pokemon What cave? Where is it???
You cannot find the Pokemon Darkrai in Turnback Cave in the game Pokemon Diamond. Instead you can find him in Newmoon Island.
no there is not a cave in the safari zone, but there is scyther the best pokemon in the game.
get every Pokemon in the game then go to mystery cave and catch it
You can't get into cerullean cave(the cave with mewtwo in it) on Pokemon silver because according to the game's story, the cave has caved in, but there may still be some remmants of the cave you could get to via a gameshark.
in cerulean cave at the end
its the huge sleeping thing blocking diglett cave in kanto -- IMPROVED ANSWER BY MOLOKAICREEPER: Snorlax can only be found after you beat the Elite 4 and you make it to Kanto. This time he is blocking the Diglett cave. Make sure to bring lots of Pokeballs to catch it! This is the only chance you get to have a Snorlax in this game, if you faint it, you're out of luck unless you find a Pokemon Yellow, Red or Blue to trade with.
High Leveled versions of Magneton and other obtainable Pokemon from previous areas in the game, but the Pokemon worth mentioning who is obtainable in the cave is Mewtwo.