Pokémon Phoenix Ashes

Hi all, I wanted to share with PC my idea for a new ROM hack, based on the HeartGold Version. The project's name is Pokémon Phoenix Ashes.
I would like to recruit people to help me with the actual hacking because I've no idea how to do it. It would be great if someone with knowledge of map hacking, sprites management, etc, since the writing part is covered.
I'll leave the details below. Tell me what you think!

Story
The idea is to combine the adventures of the first three generations games to emulate Ash's journey in the anime until the last episode of the Battle Frontier series, while including some of the most iconic moments in the anime and places, trainers, plot points, etc.

Main features
• Kanto's 8 Gym leaders and Elite Four (Anime structure)
• Johto's 8 Gym leaders and Elite Four (Anime structure)
• Hoenn's 8 Gym leaders and Elite Four (Anime structure)
• Orange Islands with its 4 Gym Leaders and Champion (Anime structure)
• Sevii Islands
• All 493 Pokémon catchable
• Pokémon companion
• Movements, TM/HM and Exp. System up to Gen IV games

I'm still writing the story but I attached the wip file.

Thanks in advance for reading!

I'm no expert in modern day hacking, but is it possible to fit 28 badges?

I certainly hope so!

I'm not sure if it is a thing, but it's certainly something that could be nice to see.
Perhaps a little research is in order?

I've been on it lately, but any additional input will be most welcome!