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Brown is really good if you don't mind playing a gen 1 game. It's sequel , Prism, as been in development forever but it has yet to come out yet.
For GBA games I'd recommend Flora Sky or Light Platinum. Liquid Crystal is also pretty good, it's a sort of re-imagineing of the gen 2 games on the GBA, diffrent enough for it's own playthtough.
If you're looking for something more out there, try Pokemon Snakewood
