At Mt. Pyre, after you fight Team Magma, the old lady should go up to you and say that one of the members dropped something and she will give it to you.
No, you cannot be a member of Team Aqua / Team Magma in Sapphire.
go to magma hide out
in magma hideout
Team Magma is absent in Pokemon sapphire, but exists in ruby. Same with team aqua in ruby version, both teams only coexist in Pokemon emerald version
Google Pokemon sapphire walkthrough and search through a walkthrough
The Magma Base doesn't exist in Sapphire Version, but the team Aqua's Base is located outside of Lilycove City.
your get from team aqua or team magma i think
Yes. Magma hideout
Pokemon Lottery in Lilycove Dept. store, team magma/team aqua hideout.
Yes.
near where is team aqua/magma hideout. (in lilicone)
trade harbor mail with a girl in mauville