Most top-tier hacks include all 386 Gen 3 Pokémon as catchable in a single save, and some even add Gen 4+ evolutions or the Fairy Type Difficulty Curves:
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: A visual feature that allows your lead Pokémon to walk behind you in the overworld.
If you are looking for a high-quality experience similar to what "Mangba Extra Quality" implies, these are the most reputable fan versions: Emerald Seaglass
The "Pokémon Emerald Ultra/Extra Quality" cartridges typically found on marketplaces like AliExpress or eBay are high-end . While they are not official Nintendo products, they are marketed as "extra quality" because they aim to fix the most common flaws found in cheaper bootlegs. 1. Hardware Build: The "Extra Quality" Difference
: These versions may feature custom title screens or character sprites based on the more mature manga designs of Red or Ruby.