You can only get Dig once so if you either trade one from another game or cheat you can get it back.
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yes. but you have to use the TM dig
You go to fallarbor town, enter the fossil maniacs house and talk to his sister who gives you the dig tm.
Yes, Linoone is able to learn Dig by TM.
U get it from the fossil maniac
TM 28 (dig) can be found in Route 114, in Ruby, Sapphire and Emerald. Go into the house at the top of the route and talk to the fossil maniac's little brother inside. He will give you Dig.