Two that I though of I thought I would put up here :L
Idea 1) A very rare creatu. You can only find it on a random planet on a random date. Or, rephrased, on a random date, say october 9th on scria the eggs would appear on that planet until the day ends. They will then be unavailable until another drop occurs, say november 27th on relcore.
Idea 2) When an egg, or certain egg hatch fails, you get a broken egg shell. When enough of the egg shells are accumulated then you can combine/trade them for the egg of a special creatu (one that isn't around yet, I'm not talking about an existing creatu.)
Insert criticism/feedback below :3
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