Hagoromo was born with immense power that only grew with time.
The Sage of Six Paths, Hagoromo Otsutsuki is known to be one of the strongest characters in the Naruto series.
Hagoromo Ōtsutsuki founded the various arts of ninjutsu and created the ninja world itself, which is the only statement that's required to explain why he's such a legendary figure.
The Rinnegan grants him the ability to use all of the abilities of the Six Paths Technique.
He also came to Naruto and Sasuke during their hour of need and gifted them an immense level of power, allowing them to also reach new heights of power.
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