Geodude and Nosepass.
I have Pokemon™ Ruby™ and the trainer Roxanne is leader of a Rustboro city.In Pokemon™ Saphire™ is Roxanne in Rustboro city too. Rustboro city is on the west of Hoenn™ (PKMN™ Saphire™, Ruby™ and Emerald™ world)
It is in Rusturbo City and the leader is Roxanne. She uses rock type Pokemon like geodude and nsepass such be prepared with a water/grass etc.
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
Geodude and Nosepass.
Rock
In total, you must beat four gym leaders before you can face your dad: Roxanne, Brawly, Watson and Flannery.
There is no Pokemon mansion in sapphire.
IF you want to do it with one pokemon, Train either your starter or get a dustox/high-level Beautifly or Wingull. Otherwise, raise them evenly until they are about as strong as Roxanne's team (although they probably won't be exactly the same).
He is not in Pokemon: Sapphire. You will not be able to find him. He is in Pokemon: Diamond, Pokemon: Pearl, and Pokemon: Platinum. You will definitely have trouble finding him in Pokemon: Sapphire.
Evee is not availiable in Pokemon Sapphire.
Any Pokemon in sapphire but you have to migrate
sinnoh Pokemon won't appear in Sapphire version!