I was the one who wrote it, but it could definitely use a re-write. I wrote it near the beginning of the exercise; when we still weren't sure where everything would go. People were still writing mostly about the obviously top/high stuff, and Golem seemed pretty mediocore by comparison-- but it should probably get a more positive review.
Alright here is the edit, kept a few things the same:
Geodude - Mid Tier
-Availability: Early! Comes after Mount Moon and is the first OU family you will meet. Evolves quickly, reaching Graveler (and immediately Golem by trade) at level 25.
-Stats: The Geoddude''s stats are kind of a mixed bag. While boasting great Attack and Defense stats, it also comes with a mediocre Special and Speed stat.
-Movepool: Geodude has access to Rock Slide and Dig/Earthquake TM's for STAB, and Rock/Ground coverage is unresisted in RBY. Those are the only two moves Geodude really needs, it can use the other 2 slots for filler (such as a HM04 Strength slave).
-Power: Thanks to a high Attack stat and fantastic coverage, Geodude can hit anything hard, provided they don't OHKO him before he attacks.
-Type: Much like his stats, his typing is a mixed bag. While Rock/Ground grants him a resistance to Normal, Flying, Poison, Fire, & Electric, it also makes him weak to Fighting, Ice, Water, Grass, and Ground.
--Misty: As Geodude is quadruply weak to Water moves and has low Special, even Staryu will be too much for Geodude to handle.
--Lt. Surge: Thanks to his immunity to Electric and resistance to Normal, Geodude walls this entire gym.
--Erika: Golem's quadruply weakness to Grass and low speed means Golem shouldn't even be fighting the trainers in this gym.
--Koga: Golem's Earthquake/Dig and resistances to Sludge and Explosion make it basically unstoppable here. In Yellow, this match is harder due to the omnipresence of Psychic moves hitting Golem on his low Special, but all of Koga's Pokemon in Yellow are weak to Rock Slide.
--Sabrina: Alakazam outspeeds and overwhelms Golem.
--Blaine: Golem resists Fire and his can destroys Blaine's Pokemon with Earthquake. However, Golem is also slower than Blaine's Pokemon and his Fire moves hit Golem on his lower Special. A Fire Blast burn can put Golem in a major predicament.
--Giovanni: In RB, Golem sweeps his entire team except for Dugtrio who can use Dig to dodge Earthquake (Gen I Dig is unaffected by Earthquake). In Yellow, Golem can beat the newly added Persian, but will have an overall harder time sweeping due to Ground moves being omnipresent in this match.
--Lorelei: All of her Pokemon outspeed Golem and can hit him with a Super Effective move.
--Bruno: Hitmonlee, Hitmonchan, and Machamp all hit you for super effective damage. In Yellow, the Onyx's can also hurt you with Dig / Earthquake. Although Golem's defense and Hitmonchan's low Special means Golem can contribute to this battle, it wont be able to sweep like a Water or Psychic type would.
--Agatha: You definitely have the advantage of typing, but the difference in Speed... be prepared for a long bout of annoyance by Confusion, Sleep, Paralysis and Poison if you try to defeat her with Golem. In Yellow, the first Gengar has Mega Drain (instant death) and the second has Psychic (close to instant death). Again, Golem can contribute, but can't sweep as well as a Psychic type would.
--Lance: In RB, Golem can trounce everything besides Hydro Pump Gyarados. In Yellow, not only does Gyarados still OHKO you, but now he has a Dragonair with Ice Beam and a Dragonite with Blizzard.
--Rival: Golem beats Pidgeot, Rhydon, Fire-types, Electric-types, and Exeggcutor. Don't bother with anything else.
-Additional Comments: In competitive RBY, Rock/Ground is essential, with Rhydon or Golem being on every team, and Rhyhorn appears horribly late in-game, making Golem your only real choice. However, while their ability to flat-out wall Zapdos and other opponents on the competitive scene is useful, Golem's horribly slow Speed and awful Special handicaps it against a good portion of opponents in-game, starting with Misty and Erika and becoming increasingly bad as more Water- and Ice-type users appear later. It's low Special means it's outright destroyed by Psychic-type users as well. Golem has great stats, moves, and completely destroys many opponents, but there are so many that also destroy it. Early game, it's no better than the Nidos (who appear early, are immune to Poison status and are useful throughout the game), and late game, it's outclassed by Water/Psychic types, who destroy the enemy Ground / Rock / Fire / Poison types more easily. If you real hate enemy Self Destruct / Explosion users though, it's a solid choice.
I kept most of your info in, just changed some stuff like when you mentioned Edge-Quake having awesome coverage, there is no Stone Edge in RBY lol.