This game is based on Pokemon Adventure Red Manga, and the creator changed some events to make the game longer and entertaining. Some items, Pokemon, and skills added, making the game even more different and improved from the original FireRed game.
The Pokemon Adventure is based on Pokemon FireRed US version.
This version contains the Kanto Region and the Orange Archipelago + The Beginning of Elite Four
I'm very happy to offer a full Spanish translation of this games as well, for those who would like to play Pokemon in their native language.
Version Beta 12.

Features
    Story follows the Manga exactly with few extra events.
    Only the boy is playable.
    Pokemon will follow you (Beta 12)
    Two rivals: Blue (boy rival) and Green (girl rival)
    Several Pokemon got buffed/nerfed.
    Ice-Type is super effective against Fairy. It also resists Water, Ground, and Flying-Types
    Grass-Type deals normal damage against Flying-Type.
    Rock-Type resists Dragon-Type.
    New tiles, maps, textures, items, trainer class and Pokemon sprites.
    Bonus/optional events that change the storyline.
    The main character speaks in color text.
    Several reference to the Pokemon anime, pop cultures and other games.
    Some trainers have special Pokemon.
    Fairy Type is in the game.
    Day and night system.
    Special and Physical Split
    EV are now indicated in Pokemon’s stat screen.
    Able to change outfit.
    TM are reusable
    Different Regions
    And more…

Additional Features
    Extra events and chapters
    New music
    Two rivals in the game
    The level cap was raised to 255
    New OWs for NPC
    New Trainer Sprites
    New scripts, events, and secrets to discover
    D/P/P Fonts and Textbox
    Revamped Battle (Physical and Special Split)
    Reusable TM
    New additional Pokemon Typing
    EV and IV stat check
    Mega Evolution, Primal Reversion, Battle Bond and Fusion
    Brand new items
    more…

If you have any questions, please let me know!
Thanks for checking out my listing.