The easiest way is to use the Poke'Radar.
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you might have to turn on and off and keep doing beginning over until your begginer is shiny
yes, but it's unlikely, however if you breed two Pokemon from different countries (America , japan, etc.) it will have a better chance of being shiny.
You can't. There is no such thing in any legit version of Diamond or Pearl.
To get a shiny Pokemon try using the poke radar
I think a egg with a shiny Pokemon in it is a different color
You can find shiny Pokemon randomly through out the game.
The Shiny Suicune was a game stop event held before Pokemon black and whiter where releases. You had to get either suicune riakou or entei at the event of your Pokemon Pearl/diamond/platinum/soul silver/ or heart gold version, and then transfer them to your Pokemon black/white version.
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Roselia
No.