Should you find yourself in Pegomastax lands, always keep multiple stacks of Mejoberries, and place one stack on your 10th (0) hotbar slot. They love them Mejoberries and will often insta-tame with one stack (and sometimes get a decent amount back).

One benefit to having an instant tamed Pegomastax is if you should get attacked by another while you tamed the first, or are dealing with something else, your new tame will hunt down its pal to get your items back (talk about brutal betrayal).

If you don’t have a lot of Mejoberries, put trashy items or other berries in the 10th (0) hotbar slot, instead.