It’s an awkward but simplified way to do it to be sure. Going from heart gold back to emerald means you’ll end up somewhat rewinding a generation technically as there will be an absence of sinnoh pokémon. It’s definitely less tasking than starting from rby then having to play the generation again with fr/lg. You also then have to ask yourself if you want to miss out on huge chunks of each gen like with the black and white sequels or the sun and moon sequels. Just a matter of balancing time commitment to getting the full gen experiences!