Due to legal concerns, NTEVO ROMs are now only available by providing your own ROM through our randomizer. Free randomizations are limited — for unlimited use, check out Universal Pokemon Randomizer ZX.

Rombats Pokemon Randomizer

Pokemon Randomizer Online

Randomize any GBA or DS Pokemon ROM right in your browser. Rombats Randomizer supports the full main-series catalog from Red/Blue through Black 2/White 2 — Fire Red, Leaf Green, Ruby, Sapphire, Emerald, Diamond, Pearl, Platinum, HeartGold, SoulSilver, Black, White, Black 2, White 2, and more. No downloads. No installs. Upload your ROM, pick your settings, and get your randomized version back in under a minute.

Randomize a ROM

Free, forever

These features are available on any ROM with no subscription and no trial:

  • No Trade Evolutions — every trade-evolution Pokemon (Kadabra, Machoke, Graveler, Haunter, Onix, Scyther, Seadra, Porygon, Slowpoke, and the rest) evolves by level-up or stone instead of requiring a trade.
  • Fast Text — dialog boxes run at max speed.
  • Running Shoes Indoors — run inside buildings on Gen 3 and up.

Pro — $5 per month, with a 7-day free trial

  • Custom Starters — pick any three Pokemon as your starter trio.
  • Random Wild Encounters — every wild Pokemon in every route and cave is randomized.
  • Random Trainers — every gym leader, elite four, rival, and NPC fights with a randomized team.
  • Random Movesets — Pokemon learn randomized moves at randomized levels.
  • Random Types, Abilities, and Base Stats — shuffle the Pokedex however you want.
  • Better Shiny Odds — boost shiny encounter rates.
  • Race Mode, Double Battle Mode, Metronome Only, and every other advanced toggle.
Start your free trial

Frequently asked questions

Which games are supported?

Every main-series Pokemon game from Gen 1 through Gen 5: Red, Blue, Yellow, Gold, Silver, Crystal (GB/GBC); Ruby, Sapphire, Emerald, Fire Red, Leaf Green (GBA); Diamond, Pearl, Platinum, HeartGold, SoulSilver, Black, White, Black 2, White 2 (DS). USA, European, and most international regional releases are auto-detected from the ROM header.

Do I need to download or install anything?

No. Everything runs in your browser. Upload your ROM, pick your settings, and download the randomized output — usually in ten to thirty seconds.

Is my ROM safe?

Yes. ROMs are processed on our server, used only to generate your randomized version, and automatically deleted after 24 hours. We do not distribute or share uploaded ROMs, and we do not keep personal data beyond what is needed to run the service.

How do I play the randomized ROM?

Download the output file and open it in any Pokemon-compatible emulator: mGBA or Visual Boy Advance for GBA; DeSmuME or DraStic for DS. The randomized ROM plays exactly like the original, just with your chosen changes applied.

Can I cancel anytime?

Yes. Manage your subscription from the account page inside the app. Cancel during your 7-day free trial for no charge, or cancel later and keep Pro until the end of your current billing month.