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Yes. It's called Pokemon Arceus.
You start in an expedition to the island of ${islandName}, far far from every other known places with the mission to help the people devastated by sudden disasters that are occurring there. You get there by plane, you fill the entrance form (character creation) and enter the desertic town of ${name}.
You start discovering the source of these disasters and after a lot of questing involving in helping the poor and uncultured civilization there you finally discover that some weird tribal cult living in a remote island is summoning Legendary Pokemon to make their land grow and flourish with the consequences that your island is suffering for that.
In your quest to find out this you can catch Pokémon, but there aren't markets and only a few people sell Poke Balls as a commodity because nobody really uses them, so you'll have to do some quests if you can to catch more mons or be given some.
Eventually you arrive to the island to stop the cultists who summons fucking UBERmoms to kill your shit, but you, a Smogon expert should be able to stop it. In the end you face Arceus who face you for daring killing humans and playing god when only Arceus is god and shit. Eventually you win so he let you kill whoever you want.
In the end, you defeat the cultists, destroy the island and restore the piece in the island of ${islandName}.
Im actually thinking of doing this in maybe the gen 2, gen 3 or gen 4 engine.