I'm hoping it's Articuno, always wanted one since I've picked my team.But could be Zapdos too if they want to do a countdown.
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I'm hoping for Zapdos as I have a nice Artie.
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I think it's going to be Shuckle. Not all the research breakthroughs have to be legendary Pokemon, ....
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Only if it's a shiny shuckle that makes potions if walked for 10km and rare candy if walked for 20 km.
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And legendary spawns after 50km..
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The earliest you'll see an answer to your question is next Thursday, April 12th, since you can only earn one stamp per day and this whole thing started March 30th. But yeah I'm very curious to see what it could be too...I'm hoping for Raikou, Zapdos or Articuno in that order.