They should be able to trade.
As far as I Know Chansey is not on the Pokemon Sapphire you can trade it from other versions like fire red or leaf green
you have to finish the machine on island one to trade with the ruby, sapphire, and emerald versions.
yes
No.
you need to beat the elite four on both games
You can trade between firered, another leafgreen, ruby, sapphire and emerald also Pokemon colosseum and Pokemon xd gale of darkness.
ANSWER: NOOOOoooooooooooooooooooooooooooooooo
As far as I Know Chansey is not on the Pokemon Sapphire you can trade it from other versions like fire red or leaf green
You can't
You can link and trade Pokemon with Sapphire and Emerald Versions. If you want a national pokedex, trade with leaf green version
The sapphire and Ruby (you can find both in the game) allows you to trade with Pokemon ruby, sapphire and Emerald version give it to Celio and when you give both to him it will allow him to connect with the Hoenn region allowing you to trade with those versions
you cant.
If you want to fill your pokedex, you must trade between Ruby and Emerald to gain the Pokemon that are not in Sapphire.
you have to finish the machine on island one to trade with the ruby, sapphire, and emerald versions.
No you cannot trade from Sapphire to Platinum. The closest thing that you can do to that is migrate from Sapphire to Platinum.
You must migrate a Kyogre from Sapphire or Emerald versions. Or, you can trade with friends. Hope I've helped! .:Funkeheap15>.<:.
You can trade with another sapphire, ruby, emerald, firered, leafgreen, Pokemon colosseum, Pokemon xd gale of darkness and Pokemon box ruby and sapphire.