No, Dialga is not evil; Dialga is more of a hero. I'm sure Dialga are nice. Palkia is, however, sort of evil, and Giratina is evil, but Dialga is more of a protagonist.
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Primal Dialga is the evil form of Dialga, and can only be seen in Pokemon Explorers of Time or Pokemon Explorers of Darkness. Primal Dialga looks just a little different than the original Dialga. Don't forget he can be found in Pokemon Explorers of Sky as well. He turns evil when time appears to stop. But after you defeat him, he will just fall on the floor (wtf?) but that will give you enough time to fix time, then he will become regular dialga. You can visit him again later to catch him, but i forget how. Also, there is no way to change dialga into primal dialga after you catch him.
Dialga is not in that Pokemon Emerald. Back when that game was made, Dialga didn't exist.
you do not find dialga in Pokemon pearl
we find dialga in map 3 in Pokemon deluge...
You can't catch Dialga in Pokemon White. After you beat the the Elite 4, you can use the PokeTransfer to receive a Dialga from Pokemon Diamond, or Platnium.