Download a DS emulator, find the English-patched Ride to Victory!! ROM, and play it on your phone or PC. That game is the real deal—it has a full story, voice clips from the anime, and hundreds of cards.
Finally, support the official releases whenever possible. Cardfight!! Vanguard Dear Days on Steam often goes on sale, and buying it encourages Bushiroad to release more games on more platforms. The nostalgia of a GBA pixel game is strong, but the future of digital Vanguard is bright—and legally sound. cardfight vanguard gba rom download