first and only one so far was 14a 11s 15s. got lucky with it, caught it without a throw bonus on a second ball that actually hit it.
excellents are just too difficult because the radius of the white circle is small which means the size of the circle that is considered an excellent throw is also smaller.
it's why getting excellents on lugia is easy when the same size inner circle on another pokemon would probably be considered great.
plus being further away means more travel time on the ball and less time for you to throw it during the attack animation to guarantee a hit. usually I spin 2-3 times and that works for me against closer bosses like tyranitar and the legendary beasts but is too slow vs kyogre.