User blog comment:Wrath022/Chapter 517: Wendy Belserion, Review/@comment-29778526-20170115065204/@comment-7418318-20170116163121

"you have powerful villains, thus you must make them somewhat defeatable"... that's no argument. The author/mangaka who has to find a way for the protagonists to deal with the villains - or as you call it make them defeatable - is the very one that created the villains in the first place.

If you don't want to be stuck with only bullshit ways to defeat the overpowered enemies, don't make them so overpowered in the first place. Make them strong enough to be able to overwhelm any single protagonist with ease, but still not so strong that a valient effort of a team or a brilliant strategy can't put them down without the villains basically defeating themselves.