Yes, Pikachu evolves in Pokémon Sapphire if you use a Thunder Stone on it.
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No, you have to catch a Pikachu and let it evolve into Raichu with a Thunder Stone.
Pikachu do not evolve by level. They evolve when a thunderstone is used on them.
Pikachu turns into Raichu.
Pikachu will evolve into Raichu when given a thunder stone. If you mean Ash's Pikachu, then it very unlikely he will evolve his Pikachu, as Pikachu is the Pokemon Franchise's mascot.
Pikachu does not evolve through level-up -- instead, you can use a Thunderstone for it to evolve.