Question

Where you find shiny stone and oval stone?

Answer 1

for shiny stone
http://pokemondb.net/pokebase/2566/where-can-i-get-a-shiny-stone-in-pokemon-dimond
it's the same as platinum...
and for oval stone you can found one (or many) in the underground, or you can catch Chansey, i think it's always hold Oval Stone...

Comments

i say to be in platinum!! And the oval stone,WHERE IT IS?

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and i said it's the SAME as PLATINUM!
and for oval stone, look the answer above, i edited it!

Answer 2

Shiny Stone:
Easiest location is the stone in Iron Island cave near the B3F exit.

All locations include:

• Iron Island Cave B3F
• Route 210 (hidden on the eastern side of the route)
• Route 228 on a hill over a log that you can cross only with your bicycle, near a berry plot
• Repeat Pickup item for Pokemon level 61+ (10% chance)

Source: https://guidestrats.com/pokemon-platinum-shiny-stones/

Oval Stone:
Only two options here:

• The Lost Tower 2nd floor, item in front of a Youngster NPC on this floor
• Held item on wild Happiny and Chansey (50% chance to be held)

Source: https://guidestrats.com/pokemon-platinum-oval-stones/