Downloading today varies significantly depending on your hardware, as official digital storefronts have largely closed. 1. Official Digital Methods (Limited)
Previously, you could purchase the Virtual Console version from the 3DS eShop. While the store officially closed on March 27, 2023 , if you purchased it before then, you can still redownload it via your purchase history.
Emulation allows you to play the game by using a "ROM" (the game file) and an "Emulator" (software that acts like the console).