no Pokemon returns to basic never it evolves and that's that
no it does not evolve with a fire stone.
Sandshrew evolves at l.22 in pokemon crystal
You have to use a leaf stone to evolve weepinbell into victreebel.
Clefairy doesn't evolve by level, you'll have to use a moonstone on her.
In pokemon crystal Pigeotto evolve in 36lvl
you evolve tyrogue with its attack and defense equal to each other.
you trade sunkern from Pokemon gold/silver/crystal and evolve it with a sun stone
You cannot evolve Misdreavus in Crystal.
No, Sneasel cannot evolve in Crystal.
In Pokémon Crystal you can't evolve Magneton any further, because Magnezone was introduced with the IV gen games (Diamon and Pearl, Platinum).
tutwig isn't even a Pokemon in crystal maybe u hav a different language or different version
mewtwo can not evolve because he is one of those Pokemon that do not evolve.