You dont
sinnoh Pokemon won't appear in Sapphire version!
No there is no way to get to Sinnoh.
By buying a specially marked version of Black 2 or White 2 from participating Walmart stores.
There is no kanto champion. But there is sinnoh champion Cynthia at undella bay
Garatina...
You cant.
Spiritomb
In Diamond & Pearl's version of the Sinnoh Dex, Pokémon #149 is Dialga.
You can't go to Sinnoh in the Gen V games.
Munchlax is a Sinnoh region Pokemon, which when Pokemon Sapphire, Ruby, and Emerald were released, Sinnoh did not exist yet. It is unobtainable in the three games.
You can't. After beating N at his castle and obtaining the National Dex, you can catch Pokemon from Sinnoh.
you can't