Ok it may seem strange to you but this is fairly simple. Just play through the game to the rustboro city. when there you must beat gym. after you beat gym leader you have to do the team aqua/team magma run through of the rusterf tunnel . i call it whismer cave as that is the only Pokemon possible to find in there.but after that a man comes to thank you and brings you to the Devon corperation. there you will get a pokegear. if you don't get it then go to give steven letter at the next city.but with the pokegear you can check trainers you met,see the map, and check Pokemon conditions.
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There is no town map. You might be referring to the Pokenav, which is Ruby, Sapphire and Emerald's version of the Town Map. You can get it at Rustboro City from the Devon Corporation's President.
A town map is not a available in Ruby. You will get a Poke-Nav later on in the game. The Poke-Nav is a map, ribbon counter, trainer's eye, and much more.
You don't get it in you key item's bag like in FireRed.It's on your pokenav once you obtain the system.
Its on the pokegear there is a map card.
in lavaridge town