Type: Rock/Ground
Height: 1'4" Weight: 44 lbs.
Appears at: Mt. Moon, Rock Tunnel and Victory Road
Desrciption: Found in fields and mountains, people often step on or trip over them mistaking them for boulders.
Evolves into: Graveler at LV 25, Golem by Trade
Learned Skills:
Level Skill Type
----- Tackle
LV 11 Defense Curl
LV 16 Rock Throw
LV 21 Self Destruct
LV 26 Harden
LV 31 Earthquake
LV 36 Explosion
TMs: 01, 06, 08, 09, 10, 17, 18, 19, 20, 26, 27, 28, 31, 32, 34, 35, 36, 38, 44, 47, 48, 50
HMs: 04
Advice: You probably won't have anything to effective against a Geodude (unless, of course, you've got a Bulbasaur or a Squirtle). Just pound away and catch the first on you can.

Type: Rock/Ground
Height: 3'3" Weight: 232 lbs.
Appears at: Victory Road
Desrciption: Rolls down slopes to move. The Graveler rolls over any obstacle without slowing or changing direction.
Evolves into: Golem by Trade
Learned Skills:
Level Skill Type
----- Tackle
----- Defense Curl
LV 16 Rock Throw
LV 21 Self Destruct
LV 29 Harden
LV 36 Earthquake
LV 43 Explosion
TMs: 01, 06, 08, 09, 10, 17, 18, 19, 20, 26, 27, 28, 31, 32, 34, 35, 36, 38, 44, 47, 48, 50
HMs: 04
Advice:

Type: Rock/Ground
Height: 4'7" Weight: 622 lbs.
Appears at: N/A
Desrciption: Its boulder-like body is extremely hard and can easily withstand dynamite blasts without damage.
Evolves into: N/A
Learned Skills:
Level Skill Type
----- Tackle
----- Defense Curl
LV 16 Rock Throw
LV 21 Self Destruct
LV 29 Harden
LV 36 Earthquake
LV 43 Explosion
TMs: 01, 05, 06, 08, 09, 10, 15, 17, 18, 19, 20, 26, 27, 28, 31, 32, 34, 35, 36, 38, 44, 47, 48, 50
HMs: 04
Advice: You won't face on in the game, so you have to challenge a friend who has one or trade for it.

Type: Rock/Ground
Height: 28'10" Weight: 463 lbs.
Appears at: Rock Tunnel, Victory Road
Desrciption: As the Onix grows, the stone portions of its body harden to become similar to a diamond but colored black.
Evolves into: N/A
Learned Skills:
Level Skill Type
----- Tackle Normal
----- srceech Normal
LV 15 Bind Normal
LV 19 Rock Throw Rock
LV 25 Rage Normal
LV 33 Slam Normal
LV 43 Harden Normal
TMs: 06, 08, 09, 10, 20, 26, 27, 28, 31, 32, 34, 36, 40, 44, 47, 48, 50
HMs: 04
Advice: Surprisingly, it's not a very tough Pokemon. If you want a stronger Pokemon, choose a Geodude and raise it up.

Type: Rock/Water
Height: 1'4" Weight: 17 lbs.
Appears at: Mt. Moon (as Helix Fossil)
Desrciption: Although long extinct, in rare cases the Omanyte can be genetically resurrected from fossils.
Evolves into: Omastar at Lvl 40
Learned Skills:
Level Skill Type
----- Water Gun Water
----- Withdraw Water
LV 34 Horn Attack Normal
LV 39 Leer Normal
LV 46 Spike Cannon Normal
LV 53 Hydro Pump Water
TMs: 06, 08, 09, 10, 11, 12, 13, 14, 20, 31, 32, 33, 34, 44, 50
HMs: 03
Advice: Since you can only get one or fight a friend, combine it's weaknesses and you should get a rough estimate of what it's weak against.

Type: Rock/Water
Height: 3'3" Weight: 77 lbs.
Appears at: N/A
Desrciption: A prehistoric Pokemon that died out when its heavy shell made it impossible to catch prey.
Evolves into: N/A
Learned Skills:
Level Skill Type
----- Water Gun Water
----- Withdraw Water
----- Horn Attack Normal
LV 39 Leer Normal
LV 44 Spike Cannon Normal
LV 49 Hydro Pump Water
TMs: 06, 07, 08, 09, 10, 11, 12, 13, 14, 15, 17, 19, 20, 31, 32, 33, 34, 44, 50
HMs: 03
Advice: Much like it's weaker cousin, Omastar's weaknesses are found easily once you combine weaknesses of the two Types it's based on.

Type: Rock/Water
Height: 1'8" Weight: 25 lbs.
Appears at: Mt. Moon (as Dome Fossil)
Desrciption: A Pokemon that was resurrected from a fossil found in what was once the ocean floor eons ago.
Evolves into: Kabutops at Lvl 40
Learned Skills:
Level Skill Type
----- srcatch Normal
----- Harden Normal
LV 34 Absorb Grass
LV 39 Slash Normal
LV 44 Leer Normal
LV 49 Hydro Pump Water
TMs: 06, 08, 09, 10, 11, 12, 13, 14, 20, 31, 32, 33, 34, 44, 50
HMs: 03
Advice: Meh. Read what I wrote under Omanyte.

Type: Rock/Water
Height: 4'3" Weight: 89 lbs.
Appears at: N/A
Desrciption: The Kabutops' sleek shape is perfect for swimming. It slashes prey with its claws and drains the bodies.
Evolves into: N/A
Learned Skills:
Level Skill Type
----- srcatch Normal
----- Harden Normal
----- Absorb Grass
----- Slash Normal
LV 46 Leer Normal
LV 53 Hydro Pump Water
TMs: 02, 03, 05, 06, 08, 09, 10, 11, 12, 13, 14, 15, 17, 19, 20, 31, 32, 33, 34, 40, 44, 50
HMs: 03
Advice: Feh. Read what I wrote under Omayte.

Type: Rock/Flying
Height: 5'11" Weight: 130 lbs.
Appears at: Pewter City Museum (as Old Amber)
Desrciption: A ferocious prehistoric Pokemon that goes for the enemy's throat with its saw-like fangs.
Evolves into: N/A
Learned Skills:
Level Skill Type
----- Wing Attack Flying
----- Agility Psychic
LV 33 Supersonic Normal
LV 38 Bite Normal
LV 45 Take Down Normal
LV 54 Hyper Beam Normal
TMs: 02, 04, 06, 09, 10, 15, 20, 23, 31, 32, 33, 34, 38, 39, 43, 44, 50
HMs: 02
Advice: You'll face one when you take on Bruno, but it's weak against what all flying creatures are, so if you've got an Electric Pokemon, it'll do significant damage.