#27.72
Sandshrew/Tentacool
27.72
#72.27
Tentacool/Sandshrew
72.27

46(+3)
HP
43(-3)
51(-12)
ATK
63(+12)
51(-17)
DEF
68(+17)
30(-10)
SP.ATK
40(+10)
53(-23)
SP.DEF
76(+23)
60(+10)
SPEED
50(-10)
291(-49)
TOTAL
340(+49)

Regular
Reg.
Clear Body: Can't have stats lowered by other Pokémon.
Liquid Ooze: Foe's HP draining moves hurts the attacker instead of healing them.
Sand Veil: During a sandstorm, has 1.25x evasion and doesn't take sandstorm damage.
Hidden
HA
Rain Dish: During rainy weather, restore 1/16th max HP each turn.
Sand Rush: During a sandstorm, has 2x SPEED and doesn't take sandstorm damage.

x4
-
Grass
x2
GroundIcePsychicWater
-
x1
DarkDragonFireFlyingGhostGrassNormalSteel
BugDarkDragonFairyFightingFlyingGhostGroundIceNormalPsychicWater
x0.5
BugFairyFightingRock
FirePoisonRockSteel
x0.25
Poison
-
x0
Electric
Electric

#27
Sandshrew
27
Lv.22
#28
Sandslash
28
#27
Sandshrew
27
Lv.22
#28
Sandslash
28
#72
Tentacool
72
Lv.30
#73
Tentacruel
73
#72
Tentacool
72
Lv.30
#73
Tentacruel
73

Route 4, 8, 9, 10, Mt. Moon
Pokemon: 27
Route 26, 27, Cerulean Cave, Union Cave, Victory Road, Evolve Sandshrew (Lv22)
Pokemon: 28
Route 4, 10, 12, 17, 18, 19, 20, 21, 23, 26, 27, 32, 34, 42, Bond Bridge, Boon Island, Brine Road, Celadon Sewers, Cerulean City, Chrono Island, Cinnabar Island, Crimson City, Kin Island, Kindle Road, Knot Island, Offshore Road, Resort Gorgeous, Treasure Beach, Vermillion City, Water Labyrinth
Pokemon: 72
Route 4, 10, 12, 17, 18, 19, 20, 21, 23, 26, 27, 32, 34, 42, Bond Bridge, Boon Island, Cerulean City, Chrono Island, Cinnabar Island, Crimson City, Kin Island, Kindle Road, Knot Island, Offshore Road, Resort Gorgeous, Treasure Beach, Vermillion City, Water Labyrinth, Evolve Tentacool (Lv30)
Pokemon: 73