If there is no free space in the Egg inventory, it's impossible to obtain an Alola Egg. Is this checked when the Gift is received whether you open it or not (much like the eggs), or it is checked at the moment you try to open it?
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2If you want to receive Alola eggs you need to have a spot free and it will be interesting to know if it makes sense to wait to open your received gifts or not– SysDragonCommented Jun 22, 2018 at 8:56
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1I have a feeling the gifts are not predetermined and function like a mini-pokestop, but it will require more testing to be sure. I was able to open gifts while having a full egg inventory. If the gifts were predetermined and it had an egg, it more than likely would have outputted a full inventory in the same manner as a pokestop– WondercricketCommented Jun 22, 2018 at 17:11
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Other than for eggs, it is impossible to know.– CommunistyCommented Jun 26, 2018 at 7:44
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1One way to check would have been keeping many Gifts from the time before Stardust was a possible reward and then opening them all and checking for Stardust. Did anyone do that or keep very old Gifts?– sceniaCommented Jul 28, 2018 at 11:27
2 Answers
You can always obtain an egg.
I tested this myself with multiple gifts. I followed some gifts I received when I had no egg space, and when I finally had a free spot I opened them and received a 7km egg.
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1This doesn't really prove anything, though. I've often received Gifts with only 1 or 2 items, it's very possible that contents are determined when the Gift is sent, and if there is no Egg space when it's opened, the Egg is simply lost.– sceniaCommented Jul 26, 2018 at 19:34
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The important idea here is that no matter when you received the gift. If you free egg space you can open any gift and be able to receive an egg Commented Jul 27, 2018 at 6:32
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While that's true and certainly important, that wasn't the question. Since it's the only really relevant part, I suppose it makes more sense to change the question accordingly, but as it is now, the answer doesn't fit the question.– sceniaCommented Jul 28, 2018 at 11:25
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2You can't prove that the content, other than for the egg, is decided in the moment of opening. If you receive a gift containing Great balls, it is impossible to know whether they were there at the moment when the gift was sent or randomly generated at the moment of opening the gift. Commented Jul 30, 2018 at 6:16
It is checked the moment you try to open the gift, not when you receive the gift. If you have free space when you open the gift, you have a chance to receive an Alolan egg. Note the word chance: it is not guaranteed you'd get an egg even if you open a gift with free space.
As per this question and answer, there are cases of Pokemon receiving Pokemon from eggs that were available when the eggs were open, but not when the gifts were received.
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As said by @scenia: "This doesn't really prove anything, though. I've often received Gifts with only 1 or 2 items, it's very possible that contents are determined when the Gift is sent, and if there is no Egg space when it's opened, the Egg is simply lost." Commented Oct 21, 2019 at 7:02
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1@SysDragon Thanks for the feedback. I found some evidence from a previous question in which Alolan Geodudes were received from egg gifts, where the gifts were received before Geodude was available– BGamerCommented Oct 21, 2019 at 8:12