Crystal Clear and Prism are the two that jump to mind when I think Pokemon GBC ROM hacks. From memory, Crystal Clear makes Crystal into an open world adventure with a bunch of cool other changes, while Prism has like five regions with a load of new and custom stuff. Both great though.
According to my limited experience, the top 8bits Pokemon hackroms are Crystal Clear and Prism.
Pokemon Crystal Clear is just Pokemon Crystal... with a non-lineal design, tons of extra content (new areas, challenges, easter eggs and QoL changes), character customization and following pokemon.
Pokemon Prism is a completely new region and story, with modernized mechanics (Abilities, Physical/Special split, fairy type...) plus some innovations (pokemon-only areas where you directly control a pokemon, lateral-scrolling areas, mining, gas and sound types...) and improvements (60fps, character customization and following pokemon)
The amount of content and work both teams put in a 8bit game is just astounding.
Edit: I remember more examples:
Polished Crystal and Red++, that are like Crystal and Red on vitamins respectively (specially the first one).
There are some attempts of recreating and completing the beta versions of Pokemon G/S, which had a different region (based on the whole Japan) and tone. The project is named Gold and Silver 97: Reforged
Pokemon Brown, a hack of Red by the creators of Pokemon Prism. Although I hadn't played it, I've read it's good.
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