no
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If you bought this as a download then yes you can. If you lost the disk then you are out of luck and will have to buy a new one.
you can't get another one. you only get one throughout the game
You go to the Guy in the shack in West Lumbridge Swamp and Ask him for a new one.
You need to get a Gametag, it's the only way to keep lost DS games from getting lost 24/7, they stay attached even while being used/played. If you've got insurance for your DS contact the DS company and ask them if you can get a new one.
There is not a second one there is only the first one. But in lost in blue 2 there is a second home.