How Many Players Do You Need to Defeat Articuno or Lugia?

What is the smallest number of trainers you need to defeat Articuno or Lugia? Here is what other players have learned about Legendary battles.

Ravalation: Articuno, Moltres, Zapdos and Lugia: calculating legendary bird catch rates in Pokémon Go

Wild level 1 Articuno caught! : r/TheSilphRoad

Lugia, Heroes Wiki

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Shadow Articuno Raid Guide For Pokémon GO Players: Hidden Gems

How long will legendary raids be a thing? I have spent the whole day and all my coins trying to get a Lugia without success. ;_; : r/TheSilphRoad

Low level articuno found in the wild : r/PokemonLetsGo

Lugia and Mega Alakazam raid guides. Top general counters via pokebattler.com : r/TheSilphRoad