You just evolve it by making it hold a stone (an oval one..because of the egg thing you know..) and raising it one level during the day
To evolve Chansey into Blissey, you max out Chansey's friendship and level it up.
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you cant... you have to make chansey evolve with high friendship. you can find chansy on rout 209 in diamond, pearl, and platinum
A Magikarp should evolve at about lvl 40 on Pokemon diamond
The Pokemon that can use oval stone in Pokemon platinum is Happiny. It is the pre evolve form of chansey. Mostly every chansy you catch have a oval stone.
Cranidos is a Rock type Pokemon that can be revived from a Skull Fossil in Pokemon Diamond. It will evolve into Rampardos at level 30.30
it doesn't you evolve it in a trade