Golem

Golem stands out in RBY Ubers as a Ground-type with access to Explosion. This gives it a significant niche over Rhydon, letting it deal up to 80% to tier king Mewtwo. With unresisted QuakeSlide coverage, it's not just an Explosion that it offers; its coverage helps immensely against Rhydon, Zapdos, Gengar, and Jolteon. With adequate paralysis support, Golem can deal massive damage and blow up on a high-value Pokemon, providing its teammates with incredible momentum. Golem's typing also gives it a valuable Normal resistance and an Electric immunity, helping to check threats like Tauros and Snorlax and soundly beating Zapdos and Jolteon.

However, Golem is only favored over Rhydon on offensive teams that look to overwhelm the opponent with Explosion. Rhydon fits on more team styles and offers added consistency that Golem simply can’t muster. Self-Destruct Snorlax and Explosion Mew, while great partners on offensive teams, are also capable of compressing Golem's role while having potential surprise value and allowing for more consistent team options; notably, Snorlax also possesses a stronger self-KO move thanks to STAB. Ergo, the bulkier and harder-hitting Rhydon can often fill Golem's place just fine, 3HKOing Mewtwo with Earthquake, while Golem can only do so inconsistently. Additionally, Rhydon is capable of walling non-Earthquake Mew sets and making 103 HP Substitutes, which can absorb a Seismic Toss from Chansey. Thus, Rhydon is often recommended if Golem's Explosion isn't required. Furthermore, Golem shares all of Rhydon's flaws: it's slow, specially frail, and has common weaknesses to Ice and Water. Without paralysis support, Golem struggles to win consistently in one-on-one battles, which can't always be afforded in the harsh world of RBY Ubers.