Shaymin does not evolve in Pokemon Diamond.
You can't evolve a shaymin in diamond, but you can make it a sky type in Pokemon Platinum.
yes it can evolve
you need to battle with it alot to make it happyer then it will evolve
Leave it with the nursery
you don't it;s impossible.you can make swinub evolve but not piloswine.
you don't evolve it by a stone it will evolve by levels
lvl it until it evolves
the moon stone.
The land Shaymin. Your choice is to make it land or Sky. But it doesn't technically evolve. It transforms into a Sky Shaymin.
U Level it up of course
Shaymin doesn't evolve, but you can change it's form by using the Gracedia flower, which can be given to you by a girl in Floraroma Town if you have a Shaymin in your party.
With an oval stone, you can evolve Happiny into Chanssey.But, you need to make Happiny hold that stone and then level it up in order to evolve.