No Ash is not going to battle the Sinnoh Elite 4.
Spiritomb you can see by battling Cynthia after you beat the Elite Four
it's not really known where he is. he either left sinnoh or died
You can import Pokémon from emerald to Sinnoh. First you must beat the elite four and complete the Sinnoh Pokedex.
I think you have to Beat the Elite Four, And Complete the sinnoh pokedex
This is not true.
you have to see every Pokemon in sinnoh then go to professor rowan and he will give it to you
Go to Sandgem Town and Proffesor Rowan will upgrade your pokedex if you beat the Elite Four.
No, you have to keep going.
The elite 4 are in the north-east corner of the sinnoh region
In Ruby and Sapphire yes you need to beat the Elite Four first, but in Emerald you can catch Raquazza before or after you beat the Elite Four.
Yes. You must beat the Elite Four to get anywhere in Kanto.
you have to beat the champion