How to Download Pokémon Snap on Wii: You Can't—It's N64 Only

You cannot. Pokémon Snap is an N64 game; never released on Wii. The Wii Shop Channel (for Virtual Console) closed in 2019.

Legal Ways to Play

1. Original Hardware: N64 console + cartridge (eBay, retro shops).
2. Wii Virtual Console (Legacy): If you bought it before 2019, redownload via Wii Shop (if still accessible on your Wii) or Wii U eShop (also closed).
3. NSO Expansion Pack: Pokémon Snap is on Nintendo Switch Online + Expansion Pack (official, legal, best way).
4. Emulation: PC/Android (Project64, Mupen64Plus) with legally dumped ROM.

Avoid sites offering "Wii Snap downloads"—they're piracy/malware.