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Team GO Rocket Leader and Giovanni Lineup
Starting November 9, 2021 - 12 a.m. local time
Giovanni & the 3 Leaders, Arlo, Cliff & Sierra have changed their Pokémon and therefore will now have 3 new Shadow Shiny Pokémon!
How to Challenge the leaders
To challenge one of the Leaders you have to defeat 6 Team GO Rocket Grunts and collect '6 Mysterious Components' to combine them into a Rocket Radar.

1 Radar allows you to defeat 1 Leader before it's consumed.
You will then get to encounter the first Pokémon of that leader, which can turn out to be a Shiny Shadow Pokémon!
Leader can be found at PokéStops or in Rocket Balloons.
How to Challenge Giovanni
To challenge Giovanni you need a Super Rocket Radar which is only available through
Special Research. (Currently: Misunderstood Mischief 15/16)

After defeating Giovanni you will encounter and have the chance to catch his third Pokémon which is a Shadow Legendary.
As of today, Shiny Shadow Legendary Pokémon are NOT available.