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Grumpy old man
Yep, it's a common thing. It's significantly improved by playing on an older system (pre DSi); even more modern systems (3DS, maybe others) can also get the joy of VFrame changes, which adds another degree of fun to guessing what seed you're hitting.~snip~
I think people tend to search for their most common one when performing searches, and then just keep trying until you get that one on your target seed. You can then change which one you believe is the "most common" (some people find this changes when they start holding buttons down to hit the seeds), rather than spending the time performing additional calibration time on something which may change.