a hippogryph flute, make hippogryph crash down like the dragon flute.
a punching dummy, this make use of the fact that hippogryph will go after anything you punch. A craftable dummy that can be hurt but don't lose health. Put it down near your flying gryph and punch it, the mob will swoop down to attack it, you jump on it, wrangle it, calm it. Pick up the dummy by shift-left click.
Two way:
a hippogryph flute, make hippogryph crash down like the dragon flute.
a punching dummy, this make use of the fact that hippogryph will go after anything you punch. A craftable dummy that can be hurt but don't lose health. Put it down near your flying gryph and punch it, the mob will swoop down to attack it, you jump on it, wrangle it, calm it. Pick up the dummy by shift-left click.