develop and sell for latest consoles???

[iyenal]

By engine, you mean as in the engine of the game itself, of the emulator or what exactly?
As for the GBA cardrigde part, well, for a reason Mother 3 never got localized to this day.
By the way, I´m not just going to distribute it everywhere else for free, but rather just make it this way to can push the hardware in a more easier way, while also attracting attention for an innovative way of releasing a game.
Too bad I can´t find any program to easily install to my PC to start making the GBA game to begin with.

I mean that you must own both rights of the engine and emulator (or open source with commercial use allowed in license).