Here is a full hack for Pokemon - FireRed which won some awards in 2012 on Pokecommunity.com
Dark Rising Pokemon Rom
DROPOUT.TV: No ads. Available WORLDWIDE. App available in Canada, New Zealand, Australia and the U.S. So I started hacking Pokemon Ruby to make it as creepy, dark and depressing as possible. Here's what I've accomplished so far - its still a work in progress. We provide you with free direct download for Pokemon GBA ROMs. Pokemon Liquid Crystal (hack) Region: Johto size =6.34 MB. Pokemon Dark Violet (hack) Region: Kanto.
The Story begins in a dream. A Pokemon suddenly appears and chooses you, a young boy/girl, to save not only it, but the world itself.

You awake asking yourself questions. Deciding to ignore the dream for now, you step out into your home town known as Fells in the Core Region. Your best friend, who also had the same dream, stops you at the front door to inform you of an emergency message from the town’s Professor. When you encounter the professor, he quickly informs you of the disasters and climate changes occurring all over the Core Region. His workers in panic, he asks you to visit the delivery station and pick up a package for him from Prof.Oak. As you set out on this simple task, you encounter a mysterious girl who appears to know knowledge of the dream you’ve had about a creature name DARUGIS. After receiving the package, a powerful pokemon is within you and your friend, Pete, sight. Eager to test your early skills against a powerful pokemon, you quickly engage in a battle with it. The pokemon uses it’s powerful winds, easily defeating your pokemon and knocking you out in the process. After awakening in your room, you see Pete and your mother patiently waiting for your recovery. You soon begin to realize this is the start of a journey into many mysteries and powerful pokemon you can’t wait to challenge.
Features:
Moemon, For People Who Want To Fuck Their Pokemon. Moemon is identical to Pokemon FireRed. HACK INFORMATION Rom Hack of Pokemon Black 2 STORY After becoming the League Champion and defeating the final Hurrah Island challenge Prof. Kukui allowed Sun/Moon and others to travel to the Unova Region for a year and test what they learned in Alola. Your rival Gladion followed and together you chose new starters for the journey across.

386 Pokemon from regions Kanto, Johto, Hoenn, Sinnoh, & Unova, all appear.
There’s 8 badges. Each gym leader will have his/her own signature Pokemon that is not obtainable in the hack.
Pokemon Gaia Download

All Original Characters & Trainers, including some fan favorites from the anime such as: Ash Ketchum, Misty, & Brock
Aside from the anime favorites, Yami Yugi from the YUGIOH Series will also have a short apperance in the hack as a Gym Leader. There will be newer generation moves. Some to note are Shadow Claw, Roost, Scald, & plenty more. DW Abilities (Yes that includes the overused fan favorites of Drizzle Poliwag, Drought Vulpix, & Speed Boost Torchic.) All Pokemon will learn some of their best egg moves from gen 3-5 by level up instead of breeding. (Serebii.net Pokedex was used for this information.) Inside every pokemon center, there’s a Nurse Joy & Doctor Roy. Doctor Roy will be the one to heal your POKEMON. Nurse Joy will be next to him and challenge you to a double battle along side Doctor Roy. This is helpful for exp points.

Pokemon Rom Hack Dark Rising
Pokemon Rom Hacks With Dark Story

Pokemon Rom Hacks Gba
Many years ago in my youth I used to be into ROM hacking the original Red and Blue generation. Not to a great standard, I'd make them in my bedroom and hand them out at school on floppy disks. Years past and I forgot all about ROM hacking.
Then I found Light Platinum...
I played a whole bunch of ROM hacks and was impressed by how much the quality had improved in the last fifteen years and started messing around with it again. Still, not to a great standard.
But I had an idea. I thought to myself that 'one day someone should make a hack set during the Pokémon war' then I thought to myself: hang on. I'm someone, and today is one day. So I sat down and started developing Pokémon WAR.
PREMISE:
Pokémon WAR is based between five and ten years before the adventures of Red.
The region of Kanto has been taken over by an international terrorist organisation known only as Team Rocket. Using nefarious means and devious tactics the Rockets have captured key strategic points across the region and are plotting a coup d'etat of the Pokémon League. Should the Rockets defeat the league and appoint a champion all hope of peace will be lost.
A small group of elite trainers led by Professor Oak are mounting a fightback against the Rockets. Only the Pokerebels can liberate the people of Kanto and restore order to the region.
You play as a fully grown adult man from New Bark Town in the neighbouring Johto region. With Pokerebels failing to the east Professor Oak has fled to Johto to recruit new blood for the resistance. Can you make the difference and finally bring an end to the Kanto civil war?
SCREENSHOTS:
FEATURES:
A whole new never before seen story line.
That's it really. It's the story that's important.
PROGRESS:
I've added three Johto cities, a few routes and caves etc. Much of Kanto will remain the same map-wise and the changes will be character/script based.
It's hard to explain without giving away too much detail. I want the player to be surprised as the story unfolds. I have much of the story laid out in my mind but am open to ideas and suggestions of you guys have any.
Finally, if there's any scripters out there interested in giving me a hand (scripting is where I'm struggling most) I'd be more than happy to graciously accept your offers of help!
DOWNLOAD:
Coming soon.
TOOLS:
Advance Intro Editor
AdvanceMap
NSEv2
XSE