if your talking about celebi the legendary Pokemon then the only way is cheating or go to a Nintendo event
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.
Route 115
Murkow can't be found in the wild in Sapphire version. You have to trade from Fire Red or Colosseum.
You must trade from LeafGreen version.
In the waters of the safari zone
Diglet cannot be found in sapphire only if you trade from other version.
You can't, you have to migrate it from Pokemon Emerald, Sapphire or Ruby version.
You can not find it !!! Only with a cheat!!!
Yes, Pokemon Sapphire version is the version in which you can catch Latias. You can only find it once you have beaten the Pokemon League, then there is a report of a legendary red flying Pokemon in Hoenn. Latias appears randomly.
You can find Brawly at the Dewford Gym on Dewford Island.
you need to trade from ruby,sapphire or emerald
go to youre dads gym