Summary
- Grass-type Pokémon can make powerful additions to any trainer's team, especially when complemented by secondary types.
- Rillaboom, Venusaur, and Sceptile are highly regarded and powerful Grass-type Pokémon with high stat totals.
- Kartana is the most capable Grass-type Pokémon in battle, boasting high physical attack and defense stats, as well as speed.
Grass-type creatures are everywhere in the world of Pokémon, and plenty of them can make powerful additions to any trainer's team. The first pocket monster listed in the Pokédex is the Grass-type starter Bulbasaur, which cemented the importance of the Grass-type classification in the series. Additionally, this common type is now a staple component of the typical starter choice triangle in games. Many highly regarded and beloved Pokémon belong to this classification, such as Chikorita, Celebi, and Leafeon, just to name a few.
Pure Grass-type species like Sceptile can be useful, although not all of them are groundbreaking. Where this type's strengths lie is when complemented by secondary types, including Bulbasaur's final stage, Venusaur, and the defensive force Ferrothorn. Grass-type Pokémon are generally unlikely to top any list of the best types overall, but they still bring plenty to the table and can be some of the most overlooked possibilities.
There are many ways to classify "strongest" in the world of Pokémon. These Grass-type Pokémon were selected based on the stat total of each while taking special movesets and other features into consideration.

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20 Tangrowth (Pokédex #0465)
Grass-Type Pokémon
Tangrowth easily ranks among the best pure Grass-types in the series, although its stat spread is complicated. With 100 HP and a fantastic 120 Defense stat, Tangrowth excels against physical attacks. Sadly, its Special Defense and Speed are terrible, both coming in at 50, and its HP is not high enough to make up for it.
Tangela evolves into Tangrowth and has been featured in a variety of Pokemon games, including Legends: Arceus.
Tangrowth's stat total is only 535, and because Tangrowth is slow, trainers must hope that the opponent does not use a super-effective Special move, as this may strike the Pokémon down in one hit. If it can survive, though, this Tangrowth's offensive stats let it defeat many opponents with ease.
19 Exeggutor (Pokédex #0103)
Grass/Psychic-Type Pokémon
The Coconut Pokémon, Exeggutor, as well as its Alolan counterpart, are extremely slow, with Speed stats of only 55. This makes some sense for a sentient, walking tree to not be very quick, yet it can put Exeggutor at a disadvantage in battle.
It can quickly make up for this downside, however, with an incredible Special Attack stat of 125 and 95 in both HP and Attack, for a stat total of 530. Defense and Special Defense are both moderate, but as long as it hangs on long enough to make its attacks, it can be a strong Grass-type.
18 Leafeon (Pokédex #0470)
Grass-Type Pokémon
One of Eevee's evolutions, and therefore a huge fan-favorite, Leafeon is not a bad little fighter in the Grass-type catalog. It only offers a stat total of 525, but has a strong Attack at 110 and Defense at 130.
The Defense is good, as Leafeon only has an HP of 65, yet if it can take down its opponents quickly enough and defend well, it is a formidable fighter. Leafeon also has the Leaf Guard ability that protects it from status ailments such as Sleep, Poison, and more.
17 Rillaboom (Pokédex #0812)
Grass-Type Pokémon
Though most of its stats are very good, particularly its main attack which comes in at 125, Rillaboom has an unfortunate Special Attack stat. While this is limiting, Rillaboom can confidently hold its own with a stat total of 530.
Its Speed is already decent, and then its signature move, Drum Beating, lowers the enemy's Speed stat, making Rillaboom even faster by comparison. Before its first move in a matchup, Rillaboom may have to withstand a strike, but it can do so fairly well with its reasonable bulk. It may not be the most popular in the series, but Rillaboom is very powerful.
16 Venusaur (Pokédex #0003)
Grass/Poison-Type Pokémon
Undoubtedly one of the most beloved Grass-type starter Pokémon, Bulbasaur is sometimes considered an "easy mode" starter in the Kanto games. On top of having the Special-focused powerhouse Grass/Poison-type, the evolved Venusaur has an even 100 in both Special Attack and Special Defense, with everything else in the low 80s for respectable bulk, giving it a stat total of 525.
Attacks like Giga Drain are excellent for damage/restoration, Sludge Bomb for Poison damage and potential status afflictions, plus a Mega Evolution (where applicable) to make it an even more imposing combatant.

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15 Gogoat (Pokédex #0673)
Grass-Type Pokémon
Gogoat may not be well known as a powerful combatant, but it is strong nonetheless. Its Speed stat is lackluster at 68, and its Defense is abysmal at 62, but its other stats are relatively well-rounded, letting it take strikes and deal them back effectively and a stat total of 531.
Attack and Special Attack stats for Gogoat both sit right around 100, and Gogoat's access to great Physical moves gives it an additional offensive boost. Additionally, Gogoats HP is phenomenal at 124, which makes up for the lack of Defense stats.
14 Sceptile (Pokédex #0254)
Grass-Type Pokémon
As one of the better final forms of a Grass starter, Sceptile can defeat many opponents with relative ease. This is largely due to its exceptional Speed stat of 120. By moving faster than most foes and using moves that benefit from its high Special Attack, Sceptile can strike quickly and decisively, making its stat total of 530 more effective.
Even once engaged in battle, it can hold its own, especially when throwing its Mega Evolution into the mix. This Pokémon accesses Special Grass-type moves like Leaf Storm, Giga Drain, and Energy Ball, making Sceptile terrifying to face. As long as it can out-speed enemies, it can dominate.
13 Tapu Bulu (Pokédex #0787)
Grass/Fairy-Type Pokémon
Being a guardian deity of Ula'ula, it is understandable that Tapu Bulu would be a powerful Pokémon. Although it does not have the typical appearance of the Grass-type, this Grass/Fairy-type commands plants to do a lot of its work for it. Even still, Tapu Bulu holds a strong Attack of 130 and Defense of 115, with a stat total of 570.
Tapu Bulu's only real weaknesses are its 70 HP and 75 Speed, but with plants restraining opponents before they can reach Tapu Bulu, it can take as long as it wants to get there and back off when needed.

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12 Ogerpon Teal Mask (Pokédex # 1017)
Grass-Type Pokémon
Ogerpon is a Legendary grass-type Pokémon that was first introduced in Scarlet and Violet's DLC, The Teal Mask. Ogerpon has several different masks it can wear. The Teal mask is the Pokémon's base form, while the other three masks — Wellspring, Hearthflame, and Cornerstone — result in Ogerpon gaining different secondary types. Wellspring adds water, Hearthflame fire, and Cornerstone rock. In of stats, however, Teal Mask Ogerpon is the strongest of them all.
Ogerpon has a 550 overall stat, with its highest individual rating being its 120 physical attack score. Ogerpon also has decent defense with a 96. Its 110-speed stat also puts Ogerpon in the top 10 fastest grass-type Pokémon. This enhanced speed is thanks to Ogerpon's Embody Aspect ability, which boosts different stats based on its mask. As one might expect, the strongest attacks Ogerpon learns - Superpower and Wood Hammer - are both physical attacks that go along with its high physical attack.
11 Wo-Chien (Pokédex #1001)
Dark/Grass-Type Pokémon
Wo-Chien is one of the Legendary Pokémon introduced in the Pokémon Scarlet & Violet games for Generation 9. It is covered in dark-green mossy material mixed with leaves and moves as though it were a giant snail.
With an overall stat total of 570, it is a powerful creature, and although a lot of those stats are primarily used in its Special Defense of 135 and Defense of 100, this just means it can hold its ground while it slowly takes down its competition.