Kaido, the father-in-law, used monster cells to create the strongest Beast.

Luo Xing transmigrates to the world of One Piece, becomes Kaido's son-in-law, and awakens the Great Inventor System.
Depending on the system level, Luo Xing can create various magical items.
Inventor Level 1: Stretch underwear, plush bra...
Inventor Level 2: Tiger-level Monster Cell...
Inventor Level 3: Demon-level Monster Cell, Triple Gravity Training Room, Basic Time Chamber...
……
Inventor LV10: Flowing Blade, Time Machine, God-level Monster Cell!
...
When a Zoan-type character consumes a monster cell, it's equivalent to everyone becoming an Ancient Zoan, or even a Mythical Zoan!
"Father-in-law Kaido, please consume this god-level monster cell!"
Azure Dragon Form + God-Level Monster = World Destruction!
Luo Xing is going to build the strongest Beast Pirates crew in history!