Over the past few months, I and others have been working on a ROM editor for Pokémon Mystery Dungeon: Rescue Team DX. It's still very much a work-in-progress, but there's enough there to warrant a thread about it.
This ROM editor has two target audiences: users and developers. For users, it's designed to be as easy to use as possible. Just give it your already extracted ROM (this will be made easier in the future), and follow the prompts. For developers, C# and Lua can be used to make