Articuno, Zapdos, Moltres, Kyogre and Groudon are the Research Breakthrough rewards in Pokémon GO during November and December 2019. Read on below for the official announcement:
A Research Breakthrough reward rotation is coming!
Trainers,
We’re excited to share a few changes to Field Research rewards starting soon!
Field Research Updates
- From November 1, 2019, at 1 p.m. PDT (GMT −7) to January 1, 2020, at 1 p.m. PST (GMT −8), the following Pokémon will be available as Research Breakthrough encounters: Articuno, Zapdos, Moltres, Kyogre, Groudon!
Time to head outside and see what amazing Pokémon you’ll encounter! Let’s GO!
—The Pokémon GO team
Source: Official Pokémon GO blog
Pokémon Blog 
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