Pokemon diamond water stone help

Question

i got the one on 213

i cant find any underground , actually i cant find anything underground b/c there aren't any sparkles

please help

i've already talked to the old man in eterna city many times

Answer 1

go to gamefaqs.com: there's a list of all the items where they are located at.

Answer 2

There are many underground.Keep trying.

Answer 3

um the only place i know of is under ground ... maybe u should try going to different towns then go under ground. unless you already did then i dont know