From: MarvelousGerbil | #076
My DBZ knowledge is a little flaky at this point, but wasn't Buu (and possibly Dabura) on Earth at one point in the past? So technically that would be the strongest pre-Raditz encounter.
Technically I guess. I'm not really sure how Buu's egg ended up on Earth of all places. Dabura lived in the Demon Realm up until Babidi recruited him. But yeah, technically Buu is the strongest being on Earth (and in the universe) throughout all of Dragonball and Z, but he's hibernating.
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