If you are referring to secret bases, then a WiFi connection is needed.
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underground
You can find everstones underground
The moon stone is used in Pokemon Diamond to evolve certain Pokemon. You can find one by looking in the Underground.
it's ZAP PLATE and you find it underground
To find heart scales on Pokemon diamond/pearl you need the explorer kit to go underground. once you are underground look for cracks inthe wall, and eventully you will find a heart scale in the cracks.