Lvl 40 solos Flareon Raid Boss
Finally, a video evidence of it happening...Found originally on SR and done by kieng...OP is honest that they have maps and he used 4x 100% Lvl 39 Golems with RT/SE. 2x Vaps never entered the battle (one reason you can pretty much always stop at 4x maxed attackers for raids at least...).
Good points to note and I'd agree is that dodging to fire off another charge move is worth it...Also, he is on an iPhone 6s and start lag is a mere 2 secs. Now, only Jolteon left as last unsoloable Tier 3 Raid boss.
https://www.reddit.com/r/TheSilphRoad/comments/6mz8zk/video_evidence_of_flareon_successfully_solod/
https://www.youtube.com/watch?v=dXD--WG_2_8
Answers
What about Bulldoze then? A 2-bar ground move that's fast enough would be what might help because the main problem is charging stuff enough to land the specials before getting KO-ed. In simulations of lvl 40 Rhydons, they always get KO-ed eventually and they can only land 3 120 ground move specials (Earthquake). If there was a 2 bar move that as a whole could deliver more than 120 damage, the Rhydon could unleash one bar attack before fainting, doing some extra damage.