You'll just need to trade for them, or transfer them into the Pal Park from Pokemon Ruby, Sapphire, or Emerald.
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Kanto/Hoenn-migration. Also for Johto but you must migrate from Emerald, after beating the league in Emerald, you go to the Safari Zone and there'll be a new area. In the new area you can find Johto Pokemon including the starters (the starters are EXTREMELY rare to find though.)
In order to get Hoenn Starters, you have to have defeated Red at Mt. Silver. Then, go to Silph Co. in Saffron City. Once there, talk to Steven, the Hoenn Champion. Choose one of the colored stones to match up to the type of the Hoenn Starter pokemon.
No you can not. You can only stay in Shinno in Platinum. On Pokemon Heart Gold and Soul Silver you can go to Kanto but not Hoenn and Shinno.
u could cheat or use the wifi trade center
All the starters are equally good.