Mega Man (200X) / Powered Up (20XX)
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Mega Man 2 (200X)
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World (200X+a)
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Mega Man 3 (20XX)
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World 2 (200X+a/20XX, several months after World)
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Mega Man 4 (20XX, 1 year after Mega Man 3)
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Rockboard (20XX)
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World 3 (200X+a/20XX, several months after World 2)
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Mega Man 5 (20XX, 2 months after Mega Man 4)
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Soccer (20XX, several months after Mega Man 4)
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World 4 (20XX, several months after World 3) > World 5 (20XX, several months after World 4) > Super Adventure (20XX, 3 years after the temple of the moon rose from the ground causing an earthquake, official investigations were ended after a year because science couldn't get close to it.)
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Mega Man 6 (20XX, one year after the World Robot Union is established)
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Mega Man 7 (20XX)
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Mega Man The Power Battle (20XX, parallel world.)
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Mega Man 8 (20XX)
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Mega Man 2: The Power Fighters (20XX, parallel world, half a year after Mega Man 8.)
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Battle and Chase (20XX) > Mega Man and Bass (20XX) > Rockman and Forte: Challenger from the future (200X, canonically questionable)
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Mega Man 9 (20XX)
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Mega Man 10 (20XX)