“Pokemon Decay” is a Comleted Rpgxp Fangame made by AlmAchAndAlee. Explore the new lands of TALEM, featuring new Pokemon, an exciting new storyline, Nuzlocke features, Generation 8 mechanics, and much more.
Pokemon Decay RPGXP Fangame
- Creator: AlmAchAndAlee
- Type: RPGXP
- Language: English
- Released on: July 25, 2025
- Latest Version: v1.2.3
- Last Updated on: September 18, 2025
- Status: Completed
Also Check Out: Pokemon Awakening
Features
Regional Pokemon Origin
- Inhabited by Pokemon from Generations I to IV.
- Includes later evolutions of those Pokemon.
Environmental Adaptation
- Due to self-preservation needs, Pokemon adapted to the unique environment of the Talem Region.
- This led to changes in Pokémon typing.
Delta Species
- Pokemon that changed typing are classified as Delta Species.
- Total of 131 Delta Species exist in the region.
Additional Forms
- Includes 40 evolutions and pre-evolutions of existing Pokemon.
Other features:
- Explore the new TALEM region.
- New Storyline.
- 25+ hours of gameplay
- Mechanics up to Generation 8
- New moves and abilities
- HMs as Key Items
- Costumizable Character
- Post-Game with facilities like in Emerald’s Battle Frontier
- Quality of Life Upgrades
- Nuzlocke Mode (Level Caps, Disabled EVs, Infinite Candies)
Changelog
Version 1.2.3
- Boosted XP of trading Pokemon is x1.2 instead of 1.7 now
- Argenta is giving the trainer a rare candy after every interview now
- Feebas Encounter rate was increased to 5%
- The Battle UI of electric-typed Delta Pokemon was adjusted
- Changed one of Farigiraf’s Battle Tower Sets
- Added Drapion and Tyranitar to Roxanne’s Battle Plaza Team
- Spencers Picture in his Battle Intro was resized
- Clairs Choices Menu cannot be disallowed now
- Added a new NPC to the dojo on the Brawl Beach
- Changed some spelling mistakes
Version 1.2.2
- Fixed a summary error. Now its possible to look at the description of the moves in the Galactic Barracks
- Added a house with EV-Trainers on Route 20
- Every TM Item Ball is now in yellow colour
- Birch’s Sidequest from 1.2.0 is now doable even without starting a new game
- The female Magma Grunt on Route 1 has a Mightyena instead of a Linoone now
- Added a new stone to the Ice Puzzle in the Glacier Cave
- Changed some spelling mistakes and bad language
Version 1.2.1
- Made a completely new Battle UI
- The “Disable-EV”-Error got fixed
- Safari Zone Encounters are now marked as seen or caught in the Pokedex
- Animation Errors should be fixed now
- Skarmory’s got a complete new Battle Tower Set
- You can now walk at the Copia Reef
- The Name Rater in Paladium City is deleted
- Mandy’s Grandma got a name and sprite. Mandy’s Brother is deleted
- Changed some priority issues in the water in Ryuku City
- The Kalahari Pyramids can now be seen on the Town Map
- The Mountain Rescue Station is now an “Inside Map”
- A error where you can’t flee or catch Pokemon on Route 18 was fixed
- Changed some spelling mistakes
Version 1.2.0
A new Switch Style was added:
The Battle is on Switch Mode if you fight against a normal trainer and on Set Mode if you fight against a Boss Trainer
The list of Boss Trainers is documented here: Trainer list
All Gym Leaders can be challenged again after beating the Pokémon League
Added a new sidequest:
After you obtained the 6th badge you’ll get a package if you try to enter Route 14.
If you give this package to Prof. Birch you’ll receive a Delta Chinchou.
- Thick Club was only working on Limbace. Now it’s also working on Cubone and Marowak
- Riley’s Pokemon are one level lower and so is the level cap. Riley’s Aggron was exchanged for a Magnezone
- The Relic Statue Sidequest can only be done until you face Mandy in Shinchi
- Fixed a door teleportation error in the Taunwick Caves
- Fixed a bug where you float after losing to the Champion
- Surge, Koga, Spenser, Misty, Silver, Noland, Drake, Zinnia & Lucy received their own Battle intro
- Added A PC to the Delta Laboratory
- Increased the Dragon Tamer’s, Ace Trainer’s and Elite Four’s price money
- Decreased Erika&Flannery’s price money
- Delta Pokémon are more common now. In Delta Areas theres a change of ~15% instead of ~12% to encounter them
- Wattson still stay in front of the Power Plant even if you have the 5th Gym Badge
- Morty was exchanged for Spenser at the Kimono Girl Ceremony in the Post Game
- Fixed that theres a Madama instead of Kiyo at the Kimono Girl Ceremony in the Post Game
- Silver got a new Sprite
- Some Grass Patches on Route 2 and Greenwood (North) have been adjusted
- Fixed a surf bug in the Latios Sanctuary
- Fixed a visual bug while encountering Celebi
- Chanseys and Blisseys to train with only know Healing Wish now
- Fixed a bug with Clarence’ PSS picture while you give him the statue
- Removed Poison Gas from a few of Team Magma’s Pokémon in Berrywatch
- Changed Gengar’s Battle Tower Set to After Math instead of Poison Heal Leftovers instead of Toxic Orb
- Changed Armorow’s Battle Tower Set to Weak Armor instead of Mirror Armor
- Changed Shelly’s Muk’s Move Set to Fire Punch instead of Thunder Punch
- Changed Mr. Fuji’s (2nd fight) Suicune’s Move Set to Shell Bell instead of Leftovers and its nature to calm instead of adamant
- Changed Mr. Fujis (2nd fight) Gallade’s ability to Stance Change instead of Stead Fast
- Changed Mandy’s (2nd fight) Voltorbs ability to Aftermath instead of Guts
- Changed Mandy’s (3rd & 4th fight) Swellow’s ability to Guts instead of Scrappy
- Changed Mandy’s (2nd, 3rd, 4th & 5th fight) Treecko Line’s item to Sharp Beak instead of Dragon Fang
- Changed Mandy’s (2nd fight) Sceptile’s Move Set to Nasty Plot instead of Elemental Shot
- Changed Mandy’s (5th fight) Typhlosion’s ability to Adaptive Pelt (Attack Boost) instead of Overcoat
- Changed Mandy’s (5th fight) Sceptile’s Move Set to Elemental Shot (Fairy) instead of Thunder Bolt
- Changed Giovanni’s Mewtwo’s ability to Pressure instead of Unnerve
- Giving Flannery Venusaur the item Heavy Duty Boots
- May got a new dialouge after talking to her in the Safari Zone
- Changed some spelling mistakes and bad language
Version 1.1.0
An Exp. All is now available. You can unlock it on the PC in Oak’s tent before fighting your Rival
- You can now receive a Slugma with the ability Flame Body from a Burglar in the sewers
- Fixed some tileset issues in the Sinister Woods, Safari Zone, Shinchi and the Storage Hall in Paladium City
- Fixed Mandy’s Move Route after the battle in Shinchi
- Budew’s evolution method was changed from Happiness during day to just Happiness
- Fixed the Move Route from the Doctor on Route 3
- Fixed the position of the Picnicker in Greenwood (North)
- Changed some spelling mistakes
Version 1.0.2
- Lucy’s Move Route after you win against her is correct now
- Put an antidote instead of an awakening into berrywatch
Version 1.0.1
- Delta Speed Up Error after leaving Gym 2 was fixed
- Battle Speed Up is also working in the Safari Zone
- The last Pokémon in the bug catching contest can join the team
- The gifted Ralts in Edna can now also be a male Ralts
- Razor Claw can be used to evolve your Pokemon
- Set a location flag to Greenwood (North) so Eevee can evolve now to Leafeon
- The player can’t fly from the Bug Catching Contest, the mysterious Village and the mysterious Forest anymore
- Swinub’s, Piloswine’s & Mamoswine’s ability was changed from Voltabsorb to Justified
- Battletower Typhlosion’s item was changed from Life Orb to Weakness Policy
- Cut-bug with the Bug Catcher in Greenwood (North) was fixed
- Koga and Janine are in the prison if they got arrested
- Some Grass patches in Gym 7 were adjusted
- Flying point in Frostvale was adjusted
- The Fisherman on Route 14 doesn’t trigger an error anymore
- TM 12 on Route 1 can’t respawn after the Giovanni fight
- Lucy’s Move Route is now correct and don’t force soft resets anymore
- Mandys Cyndaquil/Quilava has Mudshot instead of Magnitude now
- Battletower Wyrdeer’s nature was changed from quiet to brave
- Changed some spelling mistakes
Game Related Stuff
Download Pokemon Decay
Previous Versions
Screenshots








How to update the game? kinda stuck in this process, really needs instructions
One of the best Fangame really loved this one, highly recommended!