Sinnoh is not a place that is possible to visit in Pokemon Emerald. It is a region, but only available to explore in the Pokemon Diamond and Pearl games.
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It has only the sinnoh region.
you are in sinnoh
Yes if you are looking at the cave of being it will take you all the way to the Sinnoh Region
Yes, Pokemon Diamond and Pearl's region name is Sinnoh Region.
No, because you cannot enter the Union Room and connect between Sinnoh and Unova region games. ( I wanted to spin trade between my White and SoulSilver game too..) NeonGreen16