The Best Grass-Type Pokémon to Use in Pokémon FireRed and LeafGreen
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Grass-type Pokémon perform well in Kanto, especially during the first half of the game, where they make battles against Brock, Misty, and random Hikers trivial. However, Grass is not a strong offensive type, as it is resisted by seven of the seventeen available types. As a result, many Grass-types rely on status moves like 
Spore, Stun Spore, 
Poison Powder, and Sleep Powder to incapacitate opponents before dealing damage.
All Grass-type Pokémon in Kanto also have a secondary typing, which brings both advantages and drawbacks. Some handle these challenges better than others, depending on their move pool, stats, and secondary typing.
Taking these strengths and limitations into account, these are the top Grass-type Pokémon to use in FireRed and LeafGreen.
Venusaur
Venusaur is undoubtedly the best Grass-type to use for a playthrough of FireRed and LeafGreen. Choosing 
Bulbasaur as your starter gives you a highly efficient option, as it matches up well against many of the early-game challenges. The beginning of the journey is typically the most difficult, as your team options are limited, so your starter is expected to carry much of the load, and Bulbasaur excels in this role.
For starters, the Bulbasaur line takes the stress out of traversing Viridian Forest, as it doesn’t have to worry about being poisoned by 
Weedle thanks to its secondary Poison typing. It then effortlessly takes down Brock’s Rock-type Pokémon and makes quick work of the Hikers in Mt. Moon to the east.
Against Misty, it resists her Water-types and defeats them with ease, and it continues its strong performance against the Sailors’ Water-type Pokémon aboard the S.S. Anne.
Your rival will give you the most trouble with his 
Pidgeotto and 
Charmeleon, so consider raising a 
Geodude to counter both and help defeat Lt. Surge.
It continues to perform well in Rock Tunnel thanks to the abundance of Hikers, and it doesn’t begin to struggle until the mid to late game, when you’ll have plenty of other teammate options to support it.
Venusaur is a well-rounded Pokémon with good stats across the board and a fantastic move pool. It learns some of its best support moves early as a Bulbasaur in Leech Seed and Sleep Powder. Round out its move set with TMs for Giga Drain and Sludge Bomb to hit hard with STAB Grass and Poison attacks. It can even learn 
Earthquake by TM if you wish, to deal serious damage to opposing Fire-types.
Exeggutor
Despite its late arrival in the game, the Grass/Psychic-type 
Exeggutor is still a top choice for your team. It has excellent overall stats, with its only real shortcomings being Special Defense and Speed. The latter can be mitigated by its ability, Chlorophyll, which doubles its Speed when 
Sunny Day is active.
Under the sun, Exeggutor becomes truly terrifying. It can sweep opposing teams with its massive base 125 Special Attack, firing off STAB 
Psychic and one-turn Solar Beam attacks. It can even learn 
Explosion via Move Tutor, allowing it to eliminate potential counters.
Another of Exeggutor’s strengths lies in its versatility. It can learn Leech Seed, Stun Spore, and Sleep Powder by level-up, enabling it to fill a support role. Its solid base 95 Attack also allows it to handle other Psychic-type Pokémon, such as those in Sabrina’s Gym, with moves like Return, Strength, and Double-Edge. Other notable attack options include Dream Eater, Giga Drain, and Sludge Bomb.
Exeggcute can be caught in the Fuchsia City Safari Zone and evolved into Exeggutor using a 
Leaf Stone from the Celadon Department Store. If you want Sleep Powder, be sure to level Exeggcute to 37 before evolving.
Victreebel/Vileplume
These two Pokémon are grouped together because of their similarities and version exclusivity. After clearing Nugget Bridge north of Cerulean City, you’ll gain access to one of these Grass/Poison-types. In LeafGreen, you can catch 
Bellsprout, which eventually evolves into the Flycatcher Pokémon, 
Victreebel. In FireRed, you’ll find 
Oddish, which evolves into the Flower Pokémon, 
Vileplume.
If you didn’t choose Bulbasaur as your starter, either option is a good choice, as both become immediately useful against the Water-type Pokémon in the Cerulean City Gym.
Their stat distributions are very similar. Victreebel is slightly faster and more offensively oriented, while Vileplume is slower but bulkier. Their move pools are also nearly identical, with both learning common support moves like Sleep Powder and Stun Spore. Victreebel has access to Razor Leaf and Slam, while Vileplume gets Moonlight for recovery and Petal Dance. However, Giga Drain is generally the better option over either of those moves. After obtaining the TMs, Sludge Bomb and Solar Beam are both solid upgrades. Solar Beam benefits from Sunny Day’s one‑turn activation, while their ability, Chlorophyll, adds further synergy by doubling their Speed in sunlight.
Both Pokémon evolve into their second stage at level 21 and reach their final stage using a Leaf Stone.
Verdict
Based on their availability and overall usefulness, these three Grass-type Pokémon stand out as the best options for a FireRed and LeafGreen playthrough. 
Parasect is the only notable omission, largely due to its poor stat distribution and unfavorable dual typing. It can still be used thanks to its niche as the only Pokémon with Spore, a 100% accurate move that puts the target to sleep, but it is typically too slow and frail to make good use of it.
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