Jolteon Raid Team

Go w golem. Good luck - doubt u will need ur 6th attacker kuz it's more of an issue taking down jolteon in time than staying alive.

Take all Glass Cannons that have Earthquake. You'll finish it very quickly. Don't worry so much about bringing beefy Pokemon. You'll be fine as long as 2-3 of your party members resist electric.

You'll probably not gonna use the 6th one, but I'd go with another golem or that confusion exeggutor, even a sandslash (MS/EQ) will do the trick, Honestly I'd even replace that dragonite.

In raids you want pokemon that naturally resist the attacks and hit hard, so you can focus on attacking witout dodging, maybe dodge just charge attacks if you see them comming (they don't have a warning)

Unfortunattelly even max to lvl 39 I don't think you can solo it, not even a thunderbolt/ thunder one.
You will time out.
And again, unfortunatelly ground combis, even with new 1.4 buff are still slower than sc/shadow ball gengar.
Keep dt/o, is second dps vs. electric, again above any ground combo.
If you attack in two, again you dont want your ground stars if you want to deal max damage to get the 3 ball bonus, you want top dps and eat damage to load your charge move.
You can ply a bit on pokebattler, the new raid feature changed like 24 hours ago is close to field experience.
Keep the rhydon(s) if close to max level. Change the psychic into solar beam on your lvl 39 Exegg.