What is the use of MS/SoB Groudon?

Killing another Groudon or Regirock/Rhydon.

Clear weather vs Kyogre DT/Thunder...MS/SoB Groudon a great option even at level 25, if 100% 984 secs to win and 31 deaths. DT/Solar Beam level 25 1087 sec and 34 deaths. I have 5 boosted Groudon all Solar Beam, if it is sunny vs Thunder Kyogre I might fast TM all to MS---fast TMs are about as valuable as 1 or 2 max revives to me. I also have 10 Rhydons 2600 to 3000 and 550 Rhyhorn candy, having a super supreme ground attacker...whatever. My city's raid map shows us every move set 60 seconds before the egg hatches--100 or more gyms I can drive to in 5 to 10 minutes

Take a screenshot of it and touch yourself while lookin at it.

It's the best moveset, counters both Groudon itself and Kyogre and has the highest neutral DPS for gym battling as well as more relevant coverage than EQ. Also does counter Regirock hard when those start coming out.

There really isn't much reason to have EQ right now. Soloing Ninetales is one, if you don't have enough maxed Gyaradoses for that. But unless we get a priority raid where you want double ground moveset, SoB is the way to go for now.

It's also miles away the best counter for soloing Omastar if it doesn't have Hydropump and even then it's on par with Exeggutor. I launched 4 SoB before fainting whereas Exeggutor got off two.