Al of the version exclusives in Sapphire don't evolve except Lotad.
Lotad-Lv 16-Lombre-Water Stone-Ludicolo
This question is too vague. There are lots of different Pokemon in Sapphire. They evolve at different levels and in fact, some of them don't ever evolve.
48-50 Rayquaza 70
No, I'm afraid you're screwed now. Not until it levels up a bit.
Feebas does not evolve at a certain level. It levels up by having its beauty level increased. Feed it a bunch of the right kind of pokeblock.
Levels Pokemon evolve range from 7-55.
Kadabra evolves at LVL. 30 {I think...} If it is already past that, it should evolve around the next few levels. If it doesn't work, try this~: Evolve Kadabra by trading.
Levels vary from level 6 all the way to level 55. Several pokemon evolve at similar levels but a majority evolve at different levels.
Pokemon that evolve with levels have certain levels, all of them are different. Some don't evolve by levels, and either have to be happy or use an evolutionary stone.
Most Pokemon evolve by levelling up. It would be a waste of time to list all of the ones that evolve at certain levels.
if he levels up he will evolve
1-100
The levels remain the same, you raise your Pokemon to those levels to evolve them.