A hack for the all versions of the game that modifies Missile's underwater pointers to make it work while inside bodies of water. Pressing the B button while being inside water with the ability equipped will transform Kirby and the ability will work as usual.
This is a change to the ability pointers of the game that allows Missile to work underwater. Just go to any body of water and press B inside it to transform.
Tools used:
HxD: Pointer modifications
Thank you to Mr.PersonMan on Discord for initially telling me about Missile working underwater :)
Database match: Hoshi no Kirby - Kagami no Daimeikyuu (Japan) (Rev 1)
Database: No-Intro: Game Boy Advance (v. 20210227-023848)
File/ROM SHA-1: 75C95413EB5BB98E8E2549BCEBCF590A0CE75C8B
File/ROM CRC32: 683D772C
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Database match: Kirby & The Amazing Mirror (Europe) (En,Fr,De,Es,It)
Database: No-Intro: Game Boy Advance (v. 20210227-023848)
File/ROM SHA-1: 6F478A455383A2A12378F292581DFD7300300700
File/ROM CRC32: 4F07C618
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Database match: Kirby & The Amazing Mirror (USA)
Database: No-Intro: Game Boy Advance (v. 20210227-023848)
File/ROM SHA-1: 274B102B6D940F46861A92B4E65F89A51815C12C
File/ROM CRC32: 9F2A3048