The gyms are at: Rustboro City, Dewford Town, Mauville City, Lavaridge Town, Petalburg City, Fortree City, Mossdeep City, Sootopolis City.
8 gyms.
You can catch Latias
Get four badges from other gyms.
1. Torchic (starter)2. Taillow Here are two main Pokemon to win (or easiest)
you find aron in ruby sapphire and emerald you find them in the second gyms c
Rusboro fortree petalburg dewford mauville lavaridge mossdeep sootopolis
i don't think so since sapphire is a game-boy version and diamond is nintedo ds version but since sapphire is a game-boy version you can migrate Pokemon from there.
there is no such thing in Sapphire
Sadly, you can't catch Groundon is the Sapphire Version, however you can in the Ruby version, you will find him in the same place you find Kyorge in the sapphire version.
Beat the gym leaders and the elite four.
Spiritomb is not available on Pokemon Sapphire Version.
In Kanto.