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!