Yes, in fact there are two types of rapidfire codes for Mario Kart DS:
Rapidfire (Works in all regions)
121595cc 00000000
Works with all items
Turbofire (Works in all regions)
121595cc 00000100
WARNING: Don't use with Spiny Shells, Thunderbolts, Boos, or Bloopers or the game will crash!!
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There are currently 8 Mario Kart games:Super Mario Kart (SNES)Mario Kart 64 (N64)Mario Kart Double Dash (GC)Mario Kart Wii (Wii)Mario Kart DS (DS)Mario Kart Arcade GP (Arcade)Mario Kart Arcade GP 2 (Arcade) (Japan only)Mario Kart Super Circuit (GBA)
no, only mario kart 7 does
Mario Kart Double Dash is the fourth game of the Mario Kart series. Mario Kart as well as all Mario games are developed by Nintendo. Mario Kart Double Dash is produced for the GameCube system.
There are both Mario Kart and Mario Kart Solus games available. With any game, Solus simply means that the game comes with no peripherals.
Here: http://bsfree.org/?s=18&d=8&g=7615 There's 895 codes here.