Which legendaries can you get from field research breakthroughs?

I know these achievement packs can give first generation legendaries. Does it give legendaries from other generations as well?

There have been:

Legendary

• April 2018: Moltres
• May 2018: Zapdos
• June 2018: Articuno
• August 2018: Raikou
• September 2018: Entei
• October 2018: Suicune
• December 2018: (Shiny) Articuno, (Shiny) Zapdos, (Shiny) Moltres, Raikou, Entei, or Suicune
• January 2019 - February 2019: (Shiny) Articuno, (Shiny) Zapdos, (Shiny) Moltres, Raikou, Entei, Suicune, (Shiny) Lugia, or (Shiny) Ho-Oh
• March 2019: Raikou, Entei, Suicune, (Shiny) Lugia, (Shiny) Ho-Oh, Regirock, Regice, or Registeel

Non-Legendary

• July 2018: Snorlax
• November 2018: Shedinja