PokéBase - Pokémon Q&A
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I'm pretty sure the only thing that gets unlocked is Cerulean Cave.

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As sumwun said already, the only thing that unlocks after defeating the E4 in RBY is Cerulean Cave. Other than that, the only other things you can really do is continue to catch Pokemon and re-battle the E4. That's really it, unfortunately.

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What about catching Mewtwo?
The answer mentions Cerulean Cave.