Can someone make a port of Pokemon Fusion Version as homebrew someday?

Yeah, gimme 2 minutes and I'll make it.

No seriously, it's not easy to port a game. You really underestimate the task.
Specifically here. It's using GL library which the Wii don't have. You'd have to rewrite all graphics code to GX. Same for input, filesystem access, probably the audio part etc.

And it's not because the game itself looks simple or is only textual that the code is simple. It's like saying old 8bits games programming was easy.
Those games were mostly coded in assembly with a lot of tricks due to the hardware limitations(and rarely a convenient click-click game engine like Unity etc.).

In short, no. Or be very patient. Or do it yourself?

 

Great. But to my knowledge not a single wii homebrew has used this. Mostly SDL, GRRLib or GX directly.

Just saw he started an IDE. It's very cool for PC. For consoles, it's another story. Pretty hard to have most functionalities with a simple and stable gui. There was Wii game studio too... No games came from this.
I'm still impressed by the trailers. Better than hollywood movies.