There is no specific level to evolve Golbat it will evolve when it's loyal to it's trainer.
Golbat evolves with happiness.
Globat evolves if you level it up with happiness value at 220 into Crobat.
Snover evolves at level 40 in Pearl.
Luxio evolves into a Luxray at level 30.
beldum. it evolves in one level to metang then that evolves in one level to metagross
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50.
Torchic evolves into Combusken at Level 16, then it evolves into Blaziken at Level 36.
Dratini evolves INTO Dragonair at Level 30 Dragonair evolves INTO Dragonite at Level 55
in Pokemon pearl scyther evolves when you give it a metal coat and then it evolves about level 25
in diamond and pearl it evolves at level 36
Skorupi evolves at level 40!!!