Unfortunately, the move Roost did not exist in FireRed/LeafGreen, or at all in Gen III. It was introduced in Gen IV.
The only way to get Roost on a Crobat is to use TM-51 in Gen IV.
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Crobat does not evolve.
Crobat does not evolve: it is the second evolution of Zubat through Golbat.
The Weakness Of Crobat's Are Rock, Psychic, Electric and Ice.
Crobat learns air slash at level 51
yes it is the 2nd best move for crobat