You get an ekans and raise it up to be an arbok p.s. ekans are really easy to find!
Using the FireRed Dongle method, in Diamond and Pearl you will find Caterpie, Metapod, Ekans, Arbok, Growlithe, Elekid and Gengar and in Platinum you'll find Caterpie, Metapod, Ekans, Arbok, Growlithe and Gengar.
route 23
You can find it in the Great Marsh with dual slot Firered. Dual slot means you put diamond in slot 1 and Firered in slot 2.
You can find an Arbok in route 3,4,26,27
You get him him somewhere in the tall grass when your about to go inside Victory Road.
you can catch arbok in the great marsh with firered inserted only 8% of time
spell arbok backwards and it spells kobra that's what arbok is do the same with ekans and obviously you will find its a snake
Arbok can be found in the Great Marsh. Make sure you have a Pokemon Fire Red game inserted as well.
at level 45 by holding a razor dick and leveling its lvl at night for its wet puss-y
you cant ,for some reason or another, you have to get Pokemon platinum and find it in the great marsh
arbok doesn't evolve.
Arbok got its name because it is cobra (with a k) backwards. You can find one in Pokémon Ruby version only by trading for it.