You're looking for a guide on how to download a ROM of Mario Kart DS and GameCube Grand Prix. I must remind you that downloading ROMs of games you don't own may infringe on copyright laws. That being said, here's some general information: Before you proceed:

Check if you own the game : If you own the original Mario Kart DS and GameCube Grand Prix games, you can consider ripping your own ROMs from your cartridges or discs. Be aware of ROM download risks : Downloading ROMs from untrusted sources may expose your device to malware, viruses, or other security threats.

If you still want to proceed: Mario Kart DS ROM:

Search for a trusted ROM site : Look for reputable ROM websites, such as Romhacking, CoolROM, or GameFAQs. Download a ROM downloader : You may need a ROM downloader or an emulator to download and play the game. Some popular emulators for Mario Kart DS include DeSmuME and MelonDS. Download the ROM : Search for "Mario Kart DS ROM" on your chosen site and follow the download instructions.

GameCube Grand Prix ROM:

Identify the game : Grand Prix is not a built-in game on the GameCube, but there are various Mario Kart games available, such as Mario Kart: Double Dash!! or Mario Kart GP. Search for a ROM : If you have identified the correct game, search for a ROM on a reputable site, following similar steps as above.

Free alternatives:

Mario Kart Tour : Nintendo offers a mobile version of Mario Kart, which is free to download and play. Mario Kart 8 Deluxe : If you have a Nintendo Switch, you can purchase Mario Kart 8 Deluxe, which offers a similar gaming experience.

Additional tips:

Use antivirus software : Always scan your downloads with antivirus software to ensure your device's safety. Respect game developers : If you enjoy a game, consider purchasing it or supporting the developers through official channels.

Please keep in mind that I do not endorse or encourage ROM downloads. If you have any questions about official Mario Kart games or alternatives, I'd be happy to help!

Mario Kart DS: GameCube Grand Prix (GCGP) is a comprehensive ROM hack for the Nintendo DS that semi-ports the GameCube's Mario Kart: Double Dash!! to the handheld. It features a total of six cups , including two "Reverse Cups" originally cut from the base game, and a 200cc engine class exclusive to VS Mode. Because of hardware limits, each kart only holds one character instead of the two found in the original GameCube version.   Key Features of the Mod   Track Recreation : Aims to be a faithful recreation of Double Dash!! tracks, art style, and music within the DS engine. Characters & Karts : Includes a selection of unlockable characters and karts from the original GameCube title. Console Compatibility : Designed and tested to work on original DS hardware, making it playable on flashcards as well as emulators.   How to Get the Mod   To play this mod, you typically need an original Mario Kart DS ROM to apply a patch. You can find development updates and potential download links on community forums:   DSHack Wiki : Provides technical details and status updates for GameCube Grand Prix . Kuribo64 Forums : A primary hub for development discussions and trailers for GCGP . MFGG Forums : Features early screenshots and feature lists for the project .   Popular Alternatives   If you are looking for even more content, consider these other major Mario Kart DS mod packs:   CTGP Nitro : The most ambitious DS ROM hack, adding over 32 new courses without replacing original content. Visit DSHack.org for more info. Double Dash Retro Track Grand Prix : A separate mod for the GameCube that adds over 60 retro tracks (including DS ones) back into the Double Dash!! engine.   [WIP] Mario Kart DS: GameCube Grand Prix