Shortly after this event started, I came across this infographic and found out just how rare the regional Pokémon are. Throughout the event, I have hatched quite a few 7km eggs. I should have tried to keep an exact count, but my best guess would be about 100 eggs in total. A majority of the eggs ended up being Meowth, but as frustrating as it was, I continued to repeat the cycle and hatch as many 7km eggs as possible.
In total, I hatched 5 Kangaskhan and 5 Mr. Mime.
Farfetch'd: I previously had captured some Farfetch'd from last Fall's event. I did not keep track of how many I hatched during this even before transfering some of them out, but I was happy to get one with 100% IVs at 624CP.
Overall, I'm pretty happy to complete my Gen 1 Pokédex and get some pretty good Pokémon. With the regionals having relatively low CP, they are more of a novelty than anything. The best part of this event was completing my Pokédex. With the low hatch-rates it is quite taxing on your incubators, but I will still be looking forward to a similar event to get Gen 2 or Gen 3 regional exclusive Pokémon. Next time they hold this event, I may not try to hatch as many as this time. Depending on how many incubators I have, I might only try to catch one of each to complete another generations Pokédex.