Pokémon Hyper Emerald v5.5: Lost Artifacts is a Chinese-developed ROM hack known for being one of the most ambitious and "heavy lore" modifications of the original Emerald engine. Key Game Features Massive Scope: Features three playable regions, including Expanded Pokédex: Includes all Pokémon up to Generation 8 , with select Generation 9 additions and original fan-made Pokémon. Combat Mechanics: Integrates modern battle features such as Mega Evolution Gigantamax Complex Storyline: