You can get a sun stone by digging underground using your Explorers Kit.
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It is sunny in Sunyshore City.
to get to sunny shore in Pokemon diamond you need to catch dialga at spear pillar
The moon stone is used in Pokemon Diamond to evolve certain Pokemon. You can find one by looking in the Underground.
You get a leaf stone underground.
In Diamond, you can obtain a Water Stone in the underground in Sunyshore City.