I don't know what the writing means but
From what I know the abyssal ruins are a place where you can find the Power Plates (Examples: Zap plate, Insect plate, and more) And If your Lucky you can find items such as ..."old crown, old gold/silver/bronze coin, old vase ,old statue, and old bracelet." These Items Are very rare and if you talk to the villa owner in Sazanami Town he will give you Money
Old bronze coin: 1,000
Old Silver coin: 5,000
Old gold coin: 10,000
Old bracelet: 25,000
Old vase: 50,000
Old statue: 200,000
Old crown: 300,000
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No, there are no legendary Pokemon there, just a rare item.
Somehting to do with the writing on the purple blocks. But I'm working on it!
16 plate but 14 are in the abyssal ruins and the other two are a house in route 13
nothing
You Battle Her At Undella Town/City She Has The Same Pokemon As In The Last Game And Shes In The 2Nd House From The PokeCenter She Talks About The Abyssal Ruins =) Hope This Helps!!