Can a Wii Memory Card Save GameCube Games?

No. Wii Memory Cards (SD cards) and GameCube Memory Cards (59-block / 251-block / 1019-block proprietary cards) are physically and logically incompatible.

How GameCube Saves Work on Wii

• Wii has two GameCube Memory Card slots (under top flap).
• Insert original GameCube Memory Card → Wii mode → GameCube game → saves to GC card.
• Wii System Menu → Data Management → GameCube — shows GC card blocks.

What Wii SD Cards Store

• Wii game saves (internal NAND + SD copy).
• WiiWare / Virtual Console saves.
• Photos (Photo Channel), Miis, Homebrew apps.
• Not GameCube data.

Modern Solutions

• GCMemoryCard Pro / MemCard PRO 2: SD-based replacement for GC cards. Unlimited saves, USB backup. Works in Wii GC slots.
• Nintendont (Homebrew): Runs GC games from USB/HDD on Wii/Wii U. Creates virtual memory cards on SD/USB (.raw files). No physical GC card needed.
• Wii U: Same GC slots. Nintendont on vWii is best experience.

If playing GC games on Wii: get a real GC memory card (cheap used) or install Nintendont for virtual cards on SD.