It's dangerous to go alone, take this:
http://www.psypokes.com/hgss/gamemaps.php?map=mtmortar
Or, if you were asking about G/S/C:
http://pokemonelite2000.com/gsfindtyrogue.html
Don't forget a ton of max repels and a few escape ropes!
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Start from Ecruteak City and go to the right and out of the city to Mt. Mortar!
no
It is in the Lower Cave of Mt. Mortar. You will need Rock Climb to get it.Inside Mt. Mortar
mt mortar
mt mortar