Metroid Dread - The Loop
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"An item to be held by a Pokémon. A mysterious goo left by SEIKAMATER"
As of version 1.2, The Royal Jelly will prevent Seikamater's pre-evolutions from evolving into anything other than Seikamater.
The Royal Jelly is consumed upon evolution.
- The Royal Jelly is based on a similar substance found in beehives.