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Home/GBA/Pokemon Onyx BlueUpdated: 2/5/2026

POKEMON ONYX BLUE DOWNLOADWorth Trying the Demo

DEMOFinal BetaGBA
Pokemon Onyx Blue
Final Beta
Difficulty
MODERATE (Tier 2)

Some challenge

Nothing about the story was changed, truly. You are a trainer who just moved to Little root Town. After setting your on-wall clock, you come down to meet your mom. Both of you talk for a while, then you go out and meet Professor Birch. After receiving your first starter Pokemon, you officially start your Pokemon journey. In your journey, you will battle and meet many different people with two evil organizations: Team Magma and Team Aqua. These two teams are trying to wake up the ancient power of Groudon and Kyogre – two Legendaries of the land and the sea.

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FIELD EVIDENCE

6 CAPTURES
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OFFICIAL INTEL

  • The game is complete now, which means there will be no bug – no freeze – no crash.
  • Your starter will be Mew – Celebi – Jirachi. Wow, really these three right from the beginning of the game? Yes, they are.
  • All Pokemon in this game are from Gen I to Gen III. You can have them right on the first route.
  • Many trainers and the Gym Leaders are edited to become more challenging than before.

# TAGS

CompletedGBACompletedEmeraldGBANEW RELEASEEmeraldGBACompletedFireRedGBAEmeraldGBA
CURATOR'S LOG
COMMUNITY #315
DexHunter Ace
DexHunter Ace
LVL. 62 EXPLORER
CompletionistShiny HuntingPokedexPost-Game

"100% Completionist. Has a spreadsheet for Hidden Item locations."

Writer Tone
Manic, obsessive, detailed. Focuses on QoL (Quality of Life) features and availability.
ENTRY DATE: February 5, 2026

Mission Report

"Following is a detailed account of my experience in this ROM hack region..."

Duration85 hours
Threat Levelhard
Tech Specs
STANDARD GBA
Ideal For
Shiny HuntersCompletionists

LOG ENTRY: LANDFALL IN ONYX BLUE

My pulse is currently resting at 120 BPM. Why? Because I just stepped off the truck in Little Root Town and the Professor didn't offer me a Treecko. He offered me a MEW. A literal deity of genetics as a starter. I checked the other balls: Celebi and Jirachi. I nearly hyperventilated. This isn't just a region; it's a completionist's fever dream.

I immediately checked my Pokedex. 0/386. The sweat is starting. I have work to do.

THE ECOLOGICAL DISASTER (IN A GOOD WAY?)

The local intelligence claimed that "All Pokemon in this game are from Gen I to Gen III. You can have them right on the first route." I treated this as hyperbole. It was not. I walked into the tall grass on Route 101 expecting a Wurmple. I found a Charmander. Then a Squirtle. Then a Bulbasaur.

While this sounds like paradise, for a hunter like me, it's statistical anarchy. The encounter tables are so diluted that finding a specific species requires patience bordering on madness. I spent four hours in one patch of grass just to confirm if the RNG was seeded correctly. Living Dex is possible without cheats. That is the only sentence that matters to me. If I can fill the box without a Gameshark, I am a happy man.

THREAT LEVEL ASSESSMENT

Do not let the cute Mythical starters fool you. The Gym Leaders here are not playing by League regulations. They have modified teams, better movesets, and higher levels. I walked into Roxanne's gym expecting a rock fight and got crushed by advanced tactics. It forces you to actually use that Mew instead of keeping it as a trophy.

FIELD NOTE: The claim of "No Bugs" seems mostly accurate, but the sheer density of species in early routes can cause some visual confusion. Keep your save file frequent.

THE HUNT FOR 100%

This expedition was a grind, but the good kind. The kind where your eyes burn but you can't look away because you still need a Feebas and you aren't leaving until you get one. Since the base architecture is Sapphire, we miss out on the Emerald Battle Frontier, but the Battle Tower is functional.

I have mapped out the locations. Legendary encounters are static, but you need to be careful. Missable event warning! Save before entering the cave of Origin or the Regi chambers. If you knock them out, they are gone. No second chances in this timeline.

FINAL LOG

My Pokedex reads 386/386. The dopamine hit was immaculate. It's a chaotic hack, lacking the polish of modern rom-base upgrades, but it scratches the itch. 100% completion took me 85 hours. Now, if you'll excuse me, I need to organize my PC boxes by color.

Final AssessmentTRY DEMO
3/5
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Community Voices

5 testimonials
"

"The starter Pokémon being Mew, Celebi, and Jirachi right from the beginning is amazing."

Player #01
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"Gym leaders and trainers are more challenging than in the original Sapphire."

Player #02
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"The graphics and animations are similar to the original Sapphire, with nice touches like water reflections."

Player #03
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"It's a simple and playable hack, no new story or mechanics, but enjoyable."

Player #04
+ 1 more testimonials from the community
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Known Issues

1 reported
Community ReportsIssues reported by players. May be version-specific.
  • 1No bugs, freezes, or crashes reported in the final beta version

💡 TIP: Check for patches/updates. Many issues get fixed in newer versions.

Creator: Zatarion

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