It was just revealed by the Youtuber TaeganAdventures, another good video “HOW TO BEAT GROUDON IN POKÉMON GO (UPDATED Groudon Raid guide: Jun 2019)”.
As pubished in the youtube page by TaeganAdventures: “Hey, Pokémon Trainers! Kyogre has swam away and Groudon tunnels its way into Tier 5 Raids, with the chance to be shiny! Today Ryan goes over the optimal strategy to take on Groudon in Pokémon Go as well as its potential usage in PvP.
0:51 Groudon’s stats and movepool
1:37 Suggested counters
6:47 Suggested group size
7:15 Effect of weather
7:53 Perfect IV Combat Powers
8:34 Usage in PvE/PvP battles
More useful info: https://pokemongohub.net/generation-3/groudon-raid-boss/
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You can check the video below: