>>56374771You should start slow anyway, because it would be way too huge of a starter project.
What you could more easily do to train yourself would be something like the dev of Unova Red did.
>take Pokémon Red>replace all Pokémon with Unova mons>change a few lines of dialogue here and there>profitUsing the pokered disassembly, it isn't even that complicated to do. There would be a huge work to do on sprites, however.
There are disassemblies for Red, Crystal and Emerald, btw.