Even with an XCI, you need the Switch firmware (version 6.2.0 or higher, since v102 requires 6.2.0 minimally). Place your prod.keys file in the emulator’s system directory.
For the modding community, the Base v1.0.2 file is the standard for applying modifications. Mods such as "Randomizers," "Shiny overworld spawns," or "Difficulty patches" are almost exclusively coded to target the updated exectutable files found in v1.0.2. Using an unpatched v1.0.0 Base often results in crashes when applying modern mods. pokemon lets go pikachu xci rom base v102 exclusive
Because this is a "Base v1.0.2" (requiring firmware 8.0.1 internally), you must install Switch firmware 8.0.1 or higher on your emulator. Do not attempt to run this on firmware 5.0; the emulator will reject the cryptography. Even with an XCI, you need the Switch firmware (version 6