If you really want a Marowak, you can get one by evolving a cubone or catching one on Victory Road.
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You cannot catch it without cheat codes because the Marowak is a scripted special Pokemon "ghost." If you really want a Marowak, you can get one by evolving a cubone or catching one on Victory Road.
Scyther which can be caught in the bug catching contest also firered can get it and a shadow scyther is in Pokemon xd gale of darkness. Marowak which can be caught at seven island in firered and leafgreen also you can train a cubone to level 30 to get marowak.
You can catch marowak in the Pokemon Tower (with all the graves) yet they are quite rare. You can also evolve cubone. The Marowak that blocks entry to the top floor is uncatchable, and even a masterball (only obtained by hacking at that stage of the game) will fail.
you can find a marrowak in victory road, or on 7 island
The Cubone evolves into Marowak at Level 28. And is a very strong but lonely Pokemon. But looks really cute.... lolhope this helped* I'm new to this so i just edited this answer for practice and don't worry i do play Pokemon