If Pokémon Crystal Kanto covers the 1st Generation and Pokémon Seaglass Emerald covers the 3rd Generation, then what hack would cover the 2nd Generation?
The answer would be Pokémon Oracle Crystal.

So far, all of the Johto routes are done.
Honestly, the colours look rather oversaturated and blending, bu that comes wi the art style. I am actually interested in this hack once things get done.
That covers the first 3 generations, but what abou the 4th?
That would be Pokémon Sinnoh Legends.

Excuse me. That was the only 'in-game' graphic released so far, since this hack is in an extremely early stage.
By the by, those who have been in this thread may be remembering my old Scarlet and Violet demake based on Pokecrystal.
That is actually on hold right now. I rebooted the source code, but, I was trying to fix a glitch that made Screech and Cotton Spore miss very frequently if their accuracies are lower than 100% and did not have any animations if they did succeed.
I might just reboo the code again, since I keep looking everywhere without anythin going right...