List of Research Breakthrough rewards

Listed below are the previous Research Breakthrough rewards:
 * 3000x XP
 * , which is either:
 * or.
 * or.
 * or.
 * or.
 * or.
 * or.
 * or.

Current: March 2020
Catching Ferroseed gives 5000 Stardust.

July 2018
In July, 2018 for the first time there was non-legendary Pokémon encounter available from Research Breakthrough, also for the first time it was Pokémon with exclusive move.

December 2018
In December, 2018, there was pool of various Pokémon added as Research Breakthrough that rewarded with one random encounter instead of guaranteed Pokémon featured for specific month.

February 2020
Catching Woobat gave 13 candies.

Trivia

 * As with Pokémon encountered as a reward for completing a Field Research task, Pokémon encountered for completing a Research Breakthrough will be level 15.
 * The Pokémon encountered in Research Breakthrough is not set when you start the week. If you hold off obtaining the last stamp and Breakthrough, it is possible to wait till the encounter Pokémon changes to immediately obtain the new Pokémon available.