You can only be in the hoenn region you can travel to any other regions
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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.
If leave Pokemon in the daycare, they level up according to how much you travel. More travel = more experience. Also, if you leave two Pokemon (one boy and one girl or one undetermined) and they like each other, you'll find an egg.
Unfortunantly you cant go to other regions in Pokemon diamond and pearl. its not like leafgreen,firered,gold,silver and crystal version where you travel to different regions. You can't, Sinnoh is the only region available in the game.
You can't in the normal region. What's bad is that, but what's good is that later in the game you can travel to 7 islands. On 1 of those islands is a daycare center that can raise 2 pokemon. It's worth the patience.
Not regions seen in other games, but you can visit some islands that are introduced in the FireRed and LeafGreen games.