the quality of the baby rhynio depends on few things, the wild rhynio level (150 for the best result), the host drag weight must be above 900 (bronto,carcha,gigan on the island), the host's level and stats (stats is important because the host is also a parent so its like normal breeding), and the cravings fulfillment. also imprint the baby for the best stats, ive tried this multiple times with my bred brontos and i always get 240+ baby rhynio

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