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Universal Pokémon Randomizer FVX
What it is
Universal Pokémon Randomizer FVX is a free, open-source desktop application for changing data in vanilla core-series Pokémon games from Generations 1–7. It runs on Linux, macOS, and Windows, with support for Game Boy, Game Boy Color, Game Boy Advance, Nintendo DS, and Nintendo 3DS titles. Pokémon: Let’s Go, Pikachu! and Let’s Go, Eevee! are not supported. Users can randomize Pokémon traits, evolutions, starters, moves, trainer and wild Pokémon, items, and type effectiveness. FVX adds palette randomization and custom player graphics, with support that varies by generation: palettes are fully supported in Generations 1–3, partly supported in 4–5, and unavailable in 6–7; custom player graphics are supported only in Generations 1–3. A seed and settings string can reproduce the same results, and randomization logs can be disabled to avoid race spoilers. Users must provide their own ROM files. ROM hacks are not officially supported. 3DS game files must be decrypted; randomized output can be saved as CXI or LayeredFS, though a loaded game update means LayeredFS is the only output option.
For and against
For
- Runs on Linux, macOS, and Windows.
- Randomizes a broad range of game data.
- Seeds and settings can reproduce results.
- Logs can be disabled for races.
- Free and open source.
Against
- Let’s Go, Pikachu! and Let’s Go, Eevee! are unsupported.
- ROM hacks are not officially supported.
- Palette and graphics options vary by generation.
- Users must supply their own ROM files.
The verdict
FVX offers extensive randomization options across supported Pokémon games, with repeatable seeds and race-friendly log controls. Check generation-specific feature support and file requirements before getting started.
Who it suits
It suits Pokémon players who want to customize randomization across supported core-series games, especially those who want to share repeatable seeds. Users should be prepared to supply their own ROM files and, for 3DS games, decrypted files.
Plans and prices
Universal Pokémon Randomizer FVX
Downloadable desktop application · requires game ROM files supplied by the user
Read 9 Oct 2026 · upr-fvx.github.io
On the record
- 3DS input
- For 3DS games, the wiki says the game files must be decrypted; supported formats include CCI/3DS, CIA, and CXI.upr-fvx.github.io · read 9 Oct 2026
- 3DS output
- Randomized 3DS games can be saved as CXI or LayeredFS; when a game update is loaded, only LayeredFS output is available.upr-fvx.github.io · read 9 Oct 2026
- FVX additions
- FVX adds Pokémon palette randomization and custom player graphics, alongside upgrades to trainer and wild Pokémon randomization.upr-fvx.github.io · read 9 Oct 2026
- Game support
- FVX supports vanilla core-series Pokémon games from Generations 1–7, except Pokémon: Let’s Go, Pikachu! and Let’s Go, Eevee!.upr-fvx.github.io · read 9 Oct 2026
- Graphics limits
- Custom player graphics are supported in Generations 1–3 and are not supported in Generation 4 or later.upr-fvx.github.io · read 9 Oct 2026
- Integrations
- The 3DS guide documents using randomized output with the Citra emulator or a 3DS running custom firmware.upr-fvx.github.io · read 9 Oct 2026
- Logs
- It can log randomization details, and the log can be disabled for races to avoid spoilers.upr-fvx.github.io · read 9 Oct 2026
- Palette limits
- Palette randomization has full support in Generations 1–3, partial support in Generations 4–5, and no support in Generations 6–7.upr-fvx.github.io · read 9 Oct 2026
- Project status
- The maker describes the Randomizer as an open-source project made possible by the Pokémon ROM-hacking community.upr-fvx.github.io · read 9 Oct 2026
- Purpose
- The Randomizer changes Pokémon game data, with optional randomizations and quality-of-life features.upr-fvx.github.io · read 9 Oct 2026
- Randomization options
- Options include changing Pokémon traits, evolutions, starters, moves, trainer and wild Pokémon, items, and type effectiveness.upr-fvx.github.io · read 9 Oct 2026
- Repeatable seeds
- The tool outputs a seed and settings string that can reproduce the same randomization results.upr-fvx.github.io · read 9 Oct 2026
- ROM hacks
- ROM hacks are not officially supported, though some may work at the user’s own risk.upr-fvx.github.io · read 9 Oct 2026
- ROM requirement
- The tool expects users to already have ROM files on their computer; the download page says users must find those files themselves for legal reasons.upr-fvx.github.io · read 9 Oct 2026
