To get the PokeNav, you have to deliver the Devon Goods to Devon, the scientist from Devon Corporation. Obtain these by beating the Team Magma Grunt in Rusturf Tunnel. Once you've done that, the president will give you the PokeNav.
Note: This is for Ruby. I'm not sure if this applies to Emerald, Sapphire, or anything else.
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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.
how to get raqueza in littletown in Pokemon ruby version
mudkip
You can't
yes