How about you finding that out on ur own.
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However many there are in Diamond, Pearl, and Platinum. There's no difference in the way evolution works. For an exact number, there are seven; eight if you count the Oval Stone. The list: Dawn, Thunder, Moon, Water, Shiny, Leaf, Sun, and Oval (if you count it).
You can but not many
there are about 7 dog Pokemon in diamond and pearl.
There are many codes online that you can access only with the drive included with action replay. there are many shiny codes but most are junk.
You can find 2. Route 6, and Dragonspiral Tower.