No, because Mega Evolution wasn't introduced until Pokemon X and Y.
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Have it hold the Sceptilite, then press "Mega Evolution" during a battle to Mega Evolve it.
Mewtwo is the ultimate Psychic type legendary Pokemon. It was introduced in the first generation and does not evolve into any other Pokemon, although as of the sixth generation it can mega evolve into Mega Mewtwo X or Mega Mewtwo Y.
A Magikarp should evolve at about lvl 40 on Pokemon diamond
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