Probably one of the Deathly Hallows is the most powerful. The Elder Wand certainly helps in battle (though its bearers often suffer a gruesome fate).
Time Turners are powerful too, but they come with limitations.
Was Harry Potter the most powerful wizard of his generation?
Is there anyone who could beat Dumbledore in Harry Potter?
What about Sirius Black? Shouldn't he be included in this list?
Who is the Half-Blood Prince in Harry Potter?
In Harry Potter, was Harry a better duelist than Kingsley?
What happened to Cho Chang in the Harry Potter series?
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