you should go to the store you bought it and ask if you can get another pokemon sappire game.
After you defeat the elite four on Pokemon sapphire you complete the pokedex and make all your Pokemon level 100.
insert the sapphire cartlige in your ds then the diamond and turn it on. Go into Pokemon diamond and an option should be migrate from sapphire. If this does not happen, there is a possibility that your game is fake. Look further into this via Google.
You... can't make our own gym. In any official Pokemon game so far.
No, it is not possible to attain every Pokemon in any Pokemon game. For example, In Pokemon Sapphire, you can't get all the Pokemon, for one, because they usually make you choose between Pokemon (Like the fossils in the desert, you have a choice of two different Pokemon).
no
Not yet but probably soon Nintendo will make a new version of ruby and sapphire.
no because nosepass is from ruby Sapphire emerald though you could make a hack of the game with all 493 Pokemon
The Move Deleter in Pokemon Ruby, Sapphire, and Emerald is found in Lilycove City.
No, Pokemon Omega Ruby and Alpha Sapphire can only have one save data per game.
You'll need 2 game cards and 2 DS's. Make one game with the Pokemon you want, then on the other make another game with a different Pokemon. Trade the 2nd Pokemon onto the 1st game, then delete data from the second game. Then make a 3rd game on the 2nd card and trade onto the first one. (:
You cannot get shaymin in sapphire, it was not invented when pokemon sapphire came out! If you want to do it anyway i suggest you use game shark. But it may seriously damage your game and could make it worthless forever so don't try it. I know because i tried to get arceus on pokemon ruby and it crashed and it is ruined forever. Hope this helps :-)
You cannot make poffins in Ruby, Sapphire, or Emerald but you can make pokeblocks at contest centers