Giovanni, Team GO Rocket's mastermind, returns in February 2023 alongside a powerful lineup that will be a challenge for many Pokémon GO Trainers. However, unlike other leaders that players will fight this month, Giovanni requires players to obtain a Super Rocket Radar. This item can only be obtained as a reward from Team GO Rocket Special Research.
https://screenrant.com/how-to-beat-giovanni-pokemon-go-february-2023/