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Home/GBA/Mario MonUpdated: 1/21/2026

MARIO MON DOWNLOADWorth Trying the Demo

DEMOv1.3GBA
Mario Mon
v1.3

Difficulty

MODERATE (Tier 2)

Some challenge

Mario Mon is a Pokemon Fire Red hack that completely replaces the original 150 pokemon and replaces them with Mario enemies and characters. Every pokemon has been completely changed including sprites, moves, evolutions, pokedex, spawning locations, etc.

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FIELD EVIDENCE

2 CAPTURES

# TAGS

GBACompletedEmeraldGBANEW RELEASEEmeraldGBACompletedFireRedGBAEmeraldGBA
CURATOR'S LOG
COMMUNITY #315
DexHunter Ace

DexHunter Ace

LVL. 35 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: January 21, 2026

Mission Report

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

Duration25 hours
Threat Levelnormal
Tech Specs
STANDARD GBA
Ideal For
ExplorersMario Fans

ARRIVAL: THE MUSHROOM... KANTO?

Touchdown in Sector 1.3. The atmosphere is... confusing. The geography screams Kantoโ€”I recognize the layout of Pallet Town instantlyโ€”but the bio-readings are off the charts. I stepped into Route 1 and was immediately assaulted by a Goomba. My Pokedex is screaming at me. 150 new entries? 150 slots to fill. I need coffee. I need Repels. I need to know if Bowser is a trade evolution immediately or I am going to have a panic attack.

THE FAUNA: 150 ANOMALIES

The local wildlife has been completely terraformed. We aren't catching pocket monsters; we are conscripting the Koopa Troop. The sprite work is... distinct. Itโ€™s a total ecological replacement. Pidgeys are Lakitus. Rattatas are Goombas. Itโ€™s a fever dream.

NOTE: Do not approach the tall grass at night. The Hammer Bros have high encounter rates and they do not miss.

I spent four hours mapping the spawn tables. The good news? The distribution is logical. You want aquatic enemies? Go to the water. You want ghosts? Lavender Town. My anxiety about missing a slot is slowly subsiding, but the lack of documentation is making my eye twitch. I have a spreadsheet for Hidden Grotto locations and I'm not afraid to use it, but here? I'm flying blind.

QUALITY OF LIFE: PRIMITIVE TECH

Let's talk logistics. This is a FireRed base, and it feels like it. The interface is dated. I tried to check for a physical/special split and got nothing. However, for a completionist, there is one feature that saves this entire expedition from being a 0/10.

I raided the Celadon shops looking for evolution items. Link Cable item is available in Department Store. Huge W. I repeat, trade evolutions are patched via item. I can evolve my Magikoopa without needing to establish a comms link with another explorer. If this wasn't included, I would have extracted immediately.

THE ENDGAME: SHORT BUT SWEET

100% completion took me 25 hours. It's a short expedition compared to the Unbound sector, mostly because the Pokedex is capped at the original 151 count, just reskinned. There is no massive post-game expansion, no Battle Frontier to lose your sanity in. It is a linear collection marathon.

Missable event warning! Save before entering the cave. The entity replacing Mewtwo (a certain villainous King) does not respawn if you knock it out. I learned this the hard way and had to roll back my save file 45 minutes. Unacceptable stress levels.

VERDICT

Living Dex is possible without cheats. That is the only metric that matters to me. It's a novelty trip, a fun diversion for the obsessive collector who wants to see Mario sprites in a Pokemon engine. But don't expect deep mechanics.

Final AssessmentTRY DEMO
3/5
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Community Voices

5 testimonials
"

"This game made me cry with how good it is"

Player #01
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"

"Best rival and story integration I've seen in a ROM hack"

Player #02
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"

"Gym 3 is challenging but fair"

Player #03
โ˜…โ˜…โ˜…โ˜…โ˜…
"

"The Mario-themed fakemon typings make perfect sense"

Player #04
โ˜…โ˜…โ˜…โ˜…โ˜…
+ 1 more testimonials from the community
โš ๏ธ

Known Issues

4 reported
Community ReportsIssues reported by players. May be version-specific.
  • 1Growth bug fixed in patch
  • 2Black screen on some emulators like My Boy (works on mGBA, Pizza Boy, John GBA)
  • 3Disobedience issues at higher levels
  • 4No link cable support for real trading/battling

๐Ÿ’ก TIP: Check for patches/updates. Many issues get fixed in newer versions.

Creator: ???

Base ROM: Pokemon FireRed

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