A1
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You can on certain types of pokemon games but don't try Rayquaza or any other rare ones or you will loose them forever
A2
: 
Yes you can heres how: Pokemon Duplication (Clone)
Put the pokemon you want to clone in an empty box, then take it out and put it in another box (make sure it's a different box), then save. But when it says "Saving do not turn off power," turn it off. The next time you turn the game back on there should be two of the pokemon you cloned. i got this cheat off of www.cheatplanet.com
A3
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Yes but you can only copy pokemon emerald version,by going to the actual battle tower or frontier not sure, then go to the pc and depoist the pokemon that you want to clone,then get off pc then save,then get back the pokemon that you depoisited then go to the lady that has i think it was 4 balls on the mat then talk to her and say yes you want to battle and she says lvl 50 or open lvl, say open lvl then choose two pokemon that you want to battle,then the first time she says "do you want to save?" say yes then the second time she says do you want to save say no then turn off gamebey then trun back on. then look at your pc and the pokemon with you and you'll have two of them. (P.S. it worked for me now i have like 20 feebases.) but you cannot clone pokemon like mew,mewtwo,groudon,kyogre,rayquaza,lugia and ho-oh.
A4
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Yes, all u have 2 do is get the pokemon u want to clone in an empty box in a pc and then put it in a diffrent box that's empty and save. when it says SAVING DO NOT TURN OFF POWER , turn it off. When u turn it on, there should be another of the same pokemon.(may not work) : ) hope i healped.
A5
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Yes but i can only do in pokemon emerald version first go to battle frontier and go to battle tower then deposit the pokemon you want to clone save the game and widtrhaw the pokemon(even the item can be clone too)then go to the first girl that tells about link battle then if he says SAVING DONT TURN OFF THE POWER make it off then the next time you open it you will see that your pokemon will be clone thank you i guess i help a little
A6
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On emerald you go to battle tower go on your pc deposit 1-5 pokemon in an empty box log off and save then withdraw them talk to the multi battle lady on the far right enter open level and when it says saving dont turn off the power turn your game off then when you go back on they will be in your pc and your party note you can clone items to just give it to the pokemon also you can cone legendaries just dont enter them in the contest I hope I helped
A7
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Do not trust them all because I have already tried and all of my saving have been deleted...i must tell you before you have the same luck as I am....din
A8
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You can't copy pokemon at all I've tried it dose nothing
A9
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U cant clone pokemon/item in Ruby or Sapphire.ONLY Emerald cos my cousin cloned some of his pokemon in Emerald and it worked but I tried for my Ruby version and all it said was the previous saved game was corrupted or smth like tt so dont waste yr time tryin to clone smth in Ruby or Sapphire