If you mean go to hoenn you can't
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You can't get into the hoenn region in Pokemon diamond. It's a 1 region game and that region is SINNOH! BY THE WAY HAVE YOU HEARD OF POKEMON X AND Y
No because it is a sinnoh Pokemon not a kanto, johto, or hoenn
Jubilife City is located in Sinnoh, not Hoenn. Since Pokemon Sapphire takes place in Hoenn, Jubilife City is not accesible. You can buy a copy of Diamond, Pearl or Platinum in which travel through Sinnoh.
you can't (get one in the kanto region and it's a key item). but you can make a blue flute in the hoenn region then migrate a Pokemon holding it
Turtwig does not appear in Pokemon Sapphire, or in Hoenn for that matter. Instead, you can find Turtwig in Generation IV (Diamond, Pearl, or Platinum).