There is a cloning glitch in emerald.
Yes.
Never (unless your game has a memory loss from glitches).
it can create glitches, or strange sprites if not used properly
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well the one i heard the most is the glitch to clone Pokemon and their held item in Pokemon emerald.
yes
Any glitches the game had have been sorted by updates of the game.
yes there are there is the cloning glitch at the battle tower which clones your Pokemon and you get it back at the same lvel and every thing but you have 2 of them (this glitch can delete Pokemon from the game just a warning).
Yes.
No there isn't!
Yes.