How do you get into ruin valley leaf green?

You go to island 6, turn right at PC, go down the stairs and direct forward.

The cave has a door and if you check it you will see some dots this is the language of the blind called Braille now you personally can't read it so don't worry because i will tell you what it says:...

The tanoby chambers are ruins where a certain Pokemon is lurking to find that Pokemon you must first solve the boulder puzzle in tanoby key once you do that you can find that Pokemon in the chambers.

On the south part of six island(also where the dotted hole is).If you didnt unlock islands 4 through 7.You need to find the ruby and sapphire and give it to Celio at the Network Machine on 1 island...

To solve the mystery of the Tanoby ruins (The ruins you were talking about), you need to solve something called the Tanoby Key. Before the Tanoby Key, the ruins are virtually useless, with no Pokemon...