Achievements and Trophies

[Jibril]

. He's not actually that hard, he's just tedious, time consuming, and cheap.

You just described the extent of "difficulty" in every role-playing game ever made, good job

Making a boss over powered with lots of cheep moves has always seemed like a design crutch to me.

Design crutches are the only way to make turn-based RPGs appear difficult. There's no such thing as a "difficult" boss fight in an RPG that is also well-designed; what most people perceive as difficulty in any turn-based game is a direct result of wasting the player's time through arbitrary design choices and/or RNG abuse.