It's random, I stock up until I have 9 10k then buy incubators and hatch all 9 at once. I usually get 1 or 2 10k sets per week.
This seems inplausible without cheating. This looks like a troll.
Getting nine 10km eggs is nearly impossible to do, as it gets harder to replace the rest when you have more 10km eggs in storage. 1 or 2 sets of nine 10k eggs means you are cheating, or you are trolling this thread because you are 14 years old.
It is not nearly impossible, it can be done. I have currently have 8 10k eggs and they have all been attained in the past 3 weeks from the same area. The last egg seems to be evading me so I agree with you about it getting progressively harder to accumulate 10k eggs when you have a few already. I have only ever gotten 2 10k eggs before this period but this is probably since I was living in a different area. I don't know if it happens as often this person says it does but if I got this many 10k eggs in such a short period I don't see why it can't happen again.
This seems inplausible without cheating. This looks like a troll.
Getting nine 10km eggs is nearly impossible to do, as it gets harder to replace the rest when you have more 10km eggs in storage. 1 or 2 sets of nine 10k eggs means you are cheating, or you are trolling this thread because you are 14 years old.