There is no Pokemon found solely in Diamond version that can be evolved with a Sun Stone.
Gloom- can be found in Routes 224, 229, and 230.
Sunkern- You need the Poke Radar to find this Pokemon in the Northern area of Route 204.
A gloom will evolve into a vileplume.
to evolve certain Pokemon
A total of three Pokemon evolve using the Fire Stone: Vulpix, Eevee, and Growlithe.
eevee in lefeon
Mismagius and Honchkrow.
none of them
the moon stone.
The moon stone is used in Pokemon Diamond to evolve certain Pokemon. You can find one by looking in the Underground.
Eevee Growlithe Vulpix
togetic-togekiss
Moon stone.
Shiny Stone