Exeggutor and Alakazam are less likely to 2hko with psychic.
Exeggutor Psychic vs Rhydon - 854/1521
Exeggutor Psychic vs Golem - 1253/1521
Alakazam Psychic vs Rhydon - 1455/1521
Alakazam Psychic vs Golem - 1521/1521
Against Exeggutor is relatively significant, but you tend to switch out vs Exeggutor since their strongest move is Rock Slide. At least Golem can explode.
Against Alakazam, Rhydon has a 4.3% chance of surviving a pair of Psychics. If either one of them is Critical (41%), you lose that, or if the first Psychic lowers Special (30%), then you lose that as well. That leaves only 0.76% chance to survive 2 Psychics. That's pretty redundant as that also means Rhydon has to be fresh.
Chansey and Starmie are more likely to die from 2 earthquakes.
These two are useful, but as I said in my last post, it's only a 28% chance of 2HKOing Starmie, while you get Blizzard/Surf/Hydro in the face. Rhydon is guaranteed to 2HKO Chansey while Golem has a 33% chance, which is definitely nice for Rhydon, but you have to take an Ice Beam, and since Rhydon is slower, Chansey needs to be Paralyzed as Ice Beam 2HKOs.
Tauros is more likely to die from a bodyslam and 2 earthquakes.
Almost guaranteed for Rhydon which is nice, but for this to work, you need the first Body Slam to Paralyze. Otherwise, you get Body Slam and an Earthquake in, then you die/switch unless Blizzard misses. This leaves Tauros at 30-40% which is nice range for most things if you don't get the 3HKO. Yay.
And has a chance to KO Golem with blizzard and an earthquake.
Basically 0%. Even if you did get that, what sort or weird switches are going on where you Earthquake/Blizzard a Golem switch-in? Maybe a Golem sacrifice instead of something else taking Earthquake? Even in a fresh 1v1, and you see that you hit with a max damage Blizzard, the following Earthquake would also need to be nearly max damage. Two Blizzards would be better unless Golem is one of the remaining Pokemon and you're just hitting it with Tauros to finish the match following that. But in that case, the 2HKO isn't that useful if you're about to win.
Snorlax is more likely to die from 3 earthquakes.
Rhydon EQ vs Snorlax - 58653/59319
Golem EQ vs Snorlax - 1140/59319
Definitely nice.
And is more likely to KO with a bodyslam and a surf.
Works roughly 80% of the time on Golem, which is nice since Golem may switch-in against Body Slam, but this assumes a slightly less common Snorlax set (opposed to the typical Physical set).
Jynx is more likely to be OHKOed by Rockslide.
Guaranteed with Rhydon, and ~56% with Golem. Only that Jynx is more likely than not to OHKO Rhydon with Blizzard (Golem always dies), so Jynx needs to be Paralyzed, and I don't really see someone keeping a Paralyzed Jynx in unless they want to sacrifice her.
Gengar is guaranteed to be OHKOed by earthquake.
Golem is at 90% to OHKO, but guarantees are nice.
Slowbro is more likely to be 3hkoed by earthquake.
Rhydon with 45070/59319 (76%) and Golem with 0% chance. The only way you're hitting Slowbro with three Earthquakes is on the switch while Slowbro Rests, so you do have to be careful with switching in, but this does work. Including Criticals though, Golem has a 24% chance for a 3HKO (at least one EQ is Critical), and Rhydon has a 22% chance, bringing his total to 81% vs Golem's 24%. Yay.
Rhydon has some chance of surviving a Lapras blizzard.
Blizzard kills Rhydon 80% of the time while Golem dies about 97% of the time. Kind of helpful.
And Lapras is more likely to be koed by 2 rockslides.
Lapras needs to be Paralyzed then, and you need to Critical, have Lapras miss/FP or Rock Slide Lapras on a switch (lol). In any case, it is 98% to 2HKO with Rhydon and 9% with Golem, so yay.
Dont underestimate Rhydon. Explosion is nice, but otherwise the benefits of Rhydon are unquestionable. Rhydon and Golem are the only pokemon in the game that you are better off with Golem than Rhydon against, if you arent exploding.
The minor damage differences are also pretty significant on a pokemon you expect to be taking a lot of resisted hits with.
Have a nice day.
As I've shown, many of these are fairly insignificant (though there are a few important ones like vs Chansey), but one of the main things is you're playing based on luck to get many of these (whether surviving or killing), instead of using Explosion which is based on the user's skill in predicting the opponent.
Also like I said, you need to carefully plan and setup these situations or else you don't get yourself into these advantages with Rhydon, and you already have to make up for the lack of unpredictability and pressure since Rhydon can't explode.
Rhydon has situations where the extra bulk and extra damage come in handy, but you need the proper execution for these to shine, and even then, many of these run on luck. Golem can put your opponent in worse positions if you predict well, and as the user of Golem, you should know what you can and can't kill successfully.
Rhydon is more "user-friendly", but Golem is more useful more often than not unless you're Exploding on Gengar/Rocks/sacs.