You can obtain 100.00% taming effectiveness on x1. Your feed timing and quality of honey (time until expiration) is key here. I just tamed a 150 at 100% for level 225 on x1 official. Use a fishing pole, equip honey, then unequip and the honey refreshes its expectation timer giving you a fresh honey and rinse & repeat. I continually refresh about 6-8 of my honey in between feedings.

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