Bulbasaur#1
Versions: Red and Blue
Type: Grass and Poison
Attacks: -Tackle -Growl Leech Seed lv7 Vine Whip lv13
Poison Powder lv20 Razor Leaf lv27 Growth lv34 Sleep Powder lv41 Solar Beam lv48
Evolutions: Bulbasaur-> Ivysaur lv16-> Venusaur lv32
Area: Pallet Town

Ivysaur#2
Versions: Red and Blue
Type: Grass and Posion
Attacks: -Tackle -Growl -Leech Seed -Vine Whip
Poison Powder lv22 Razor Leaf lv30 Growth lv38
Sleep Powder lv46 Solar Beam lv54
Evolutions: Ivysaur-> Venusaur lv36
Area: Evolve from Bulbasaur

Venusaur#3
Versions: Red and Blue
Type: Grass and Posion
Attacks: -Tackle -Growl -Leech Seed -Vine Whip
-Poison Powder -Razor Leaf Growth lv43 Sleep Powder lv55 Solar Beam lv65
Evolutions: None
Area: Evolve from Ivysaur

Oddish#43
Versions: Red
Type: Grass and Poison
Attacks: -Absorb Poison Powder lv15 Stun Spore lv17 Sleep Powder lv19 Acid lv24 Petal Dance lv33 Solar Beam lv46
Evolutions: Oddish-> Gloom lv21-> Vilplume Leaf Stone
Area: Routes 24, 25, 6, 7, 12, 13, 14, and 15.

Gloom#44
Versions: Red
Type: Grass and Poison
Attacks: -Absorb -Poison Powder -Stun Spore -Sleep Powder Acid lv28 Petal Dance lv38 Solar Beam lv52
Evolutions: Gloom-> Vileplume Leaf Stone
Area: Routes 13, 14, and 15.

Vileplume#45
Versions: Red
Type: Grass and Posion
Attacks: Once you evolve Gloom into Vileplume, it can't learn anymore attacks besides TMs and HMs.
Evolutions: None
Area: Evolve from Gloom with Leaf Stone

Paras
See Bug Pokemon stats

Parasect
See Bug Pokemon stats

Bellsprout#69
Versions: Blue
Type: Grass and Posion
Attacks: -Vine Whip -Growth Wrap lv13 Poison Powder lv15
Sleep Powder lv18 Stun Spore lv21 Acid lv26 Razor Leaf lv33 Slam lv42
Evolutions: Bellsprout-> Weepinbell lv21-> Victreebell Leaf Stone
Area: Routes 24, 25, 6, 7, 12, 13, 14, and 15.

Weepinbell#70
Versions: Blue
Type: Grass and Poison
Attacks: -Vine Whip -Growth -Wrap -Poison Powder
-Sleep Powder Stun Spore lv23 Acid lv29 Razor Leaf lv38 Slam lv49
Evolutions: Weepinbell-> Victreebell Leaf Stone
Area: Routes 13, 14, and 15.

Victreebell#71
Versions: Blue
Type: Grass and Poison
Attacks: Once you evolve Weepinbell into Victreebell, Victreebell can't learn any more attacks besides TMs and HMs.
Evolutions: None
Area: Evolve from Weepinbell

Exeggcute#102
Versions: Red and Blue
Type: Grass and Psychic
Attacks: -Barrage -Hypnosis Reflect lv25 Leech Seed lv28 Stun Spore lv32 Poison Powder lv37 Solar Beam lv42
Sleep Powder lv48
Evolutions: Exeggcute-> Exeggcutor Leaf Stone
Area: Safari Zone

Exeggcutor#103
Versions: Red and Blue
Type: Grass and Poison
Attacks: Once you evolve Exeggcute into Exeggcutor, Exeggcutor can't learn anymore attacks besides TMs and HMs.
Evolutions: None
Area: Evolve from Exeggcute