You can raise one up from a zubat or it can be found in the victory cave on the island where Ever Grand City is.
To get a Crobat on pokemon Ruby you must evolve your Golbat. If you do not already have a Golbat you can find them in many places such as: Cave of Origin, Meteor Falls, Seafloor Cavern, Shoal Cave, Sky Pillar, and Victory Road.
You can catch Golbat at above that level in Sky Pillar. Its levels will range from 48-56.
Golbat evolves when it has max friendship with its trainer so if you want Crobat be very friendly to your Golbat.
get a golbat and max out his happiness
It evolves through happiness.
give golbat lotsa love until it likes you. ( Pokemon leafgreen firered ) go to daisy's house and see if the golbat likes you. ( others ) i have no idea
Psykick like the beam
Is mean look
There is no specific level for golbat to evolve it needs to be loyal to it's trainer in order to evolve.
Use golbat a lot and he must never faint. He's happiness will increase and when it is full it will evolve
you need to have max frendship with golbat, but i think you need to trade to ruby/sapphire/emerald, then have it love you, then trade it back
Graveler-colen , kadabra-alacazam, gloom/vileplume, golbat/golbat. I don't know any others, butI believe there are more.