You cannot become an astronaut in Pokémon Sapphire, all those rumors out there about becoming an astronaut and getting to the moon to get Deoxys are completely false.
you can't you can't you can't you can't
If given to clampearl then traded it will become huntail.
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
you can bring it back to life to become an anorith
Congrats! You now have a ribbon that proves your worth plus you can do more things in sapphire now.
There is no Pokemon mansion in sapphire.
you defeat all the elites(4 of them) and the previous champion
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
to become an astronaut you have to be 2 years old
certain pokeblocks can make Pokemon happier if your talking about Pokemon emerald or Sapphire, but generally the more you raise your Pokemon the happier they become.