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Rhydon mud slap vs rock smash
I was thinking why mud slap is considered so much better than rock smash. Rhydon's primary use is against snorlax and in that case these both quick moves are almost equal. Mud slap has STAB but rock smash has SE so both are multiplied by 1,25. However MS has slightly shorter CD and slightly better EPS but these are marginal differences.
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It does depend on your local gym population. We still get a lot of Flareon and Arcanine in gyms. From your list he's sub-optimal against all of those, but he does okay against other Rhydon and non-hydro pump Gyarados. If you're attacking a lv8 gym with a Snorlax in it you don't really need to switch him out for anything but a grass/water type.