It is the big building in the north-west of rustboro city.
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Devon Corp. is in Rustburo city, west of the Pokemon gym and North of the house with 2 kids and a mother on the 2nd floor.
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You can find Devon in Mossdeep City he will give a Beldum. Note: Also works for Ruby and Sapphire.
Get a Root Fossil in the desert and talk to a scientist on the second floor of Devon Corp., (he says it will take a while, but just leave the room and go right back in)and he will gve you a Lv. 20 Lileep.