The trope i hate the most is DragonBall syndrome...
X is recognized as the strongest entity in the land which everyone recognizes.
Until you leave it.
Then Y is the strongest on the planet which every also recognizes.
Until you leave it.
Z is the strongest in the solar system, which everybody knows, its common knowledge that is never before mentioned.
The question is... if everyone knew about Y and Z how the fark was X ever considered the strongest? And NOBODY brings Y and Z up in X's region because... reasons. But everybody knew about them.