You have to beat elite 4 to get into Mewtwos cave
Rock Tunnel.
all the way back in butts cave
You Can Go Into This Cave Once You Have Beaten The Pokemon League. Cerulean Cave Is Where Chanseys And Mewto At LVL 70.
it is in ice fall cave on four island but you need to find it somewhere in the cave
you need to passs a cave look at the town map
just surf away were mewtwo is hope it helps
it is water fall and it is in ice fall cave
It's the same principle regardless of which version you're using. You can use an Escape Rope to flee.
Unknown Dungeon was the name of a cave in Red, Blue and Yellow version that is located northwest of Cerulean City you would need Surf to reach their the cave is now called Cerulean Cave.
Union Cave.
Same as on Red, Green, Blue, Yellow, The original Gold, And Silver versions
The Cave of Origin is in Sootopolis