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I seem to remember someone posting quite a way back that the eggs are hidden in areas of their respective colour. But I haven't found any others than the ones already posted myself, so can't offer anything more I'm afraid!
The final dungeon itself is very long, so there's extensive gameplay in that. Otherwise, it's well worth completing the Pokedex, as long as CBM's reward for it is still ongoing.
If you mean the Rijon-Naljo tunnel where a passport is needed, there's nothing beyond there - Naljo isn't accessible.