If you’ve ever caught two identical Pokémon in Pokémon FireRed or LeafGreen and noticed they didn’t perform the same, you weren’t imagining it.
The reason is Natures.
Every Pokémon you catch in FireRed and LeafGreen has one of 25 possible Natures.
- 20 Natures increase one stat by 10% and decrease another by 10%.
- 5 Natures are neutral and do not change any stats.
- A Pokémon’s Nature is randomly assigned when you encounter it.
- You cannot change a Pokémon’s Nature in FireRed & LeafGreen.
That 10% might not sound huge, but at higher levels, it absolutely adds up.
The 6 Main Stats Affected by Natures
Here’s a quick refresher on what each stat actually does:
- HP – How much damage a Pokémon can take before fainting.
- Attack – Power of physical moves like Earthquake or Slash.
- Defense – Reduces damage taken from physical attacks.
- Sp. Atk (Special Attack) – Power of special moves like Flamethrower or Surf.
- Sp. Def (Special Defense) – Reduces damage from special attacks.
- Speed – Determines which Pokémon moves first (priority moves aside).
Important: HP is never modified by Nature. Only the other five stats can be increased or decreased.
Full List of Natures in FireRed & LeafGreen
Below is the complete breakdown based on your table:
Neutral Natures (no stat changes):
- Bashful
- Docile
- Hardy
- Quirky
- Serious
Why Natures Matter More Than You Think
Here’s the thing: Natures can completely change how effective a Pokémon feels.
Take Charizard as an example.
- A Modest Charizard (+Sp. Atk, -Attack) is ideal for Flamethrower builds.
- An Adamant Charizard (+Attack, -Sp. Atk) weakens its strongest move category.
Same Pokémon. Completely different performance.
What most players miss is that the wrong Nature can actively hurt your strategy.
Best Nature Examples for Popular Pokémon
To make this practical, here are some ideal Nature pairings in FireRed & LeafGreen:
Physical Attackers
Examples: Snorlax, Machamp, Aerodactyl
Best Natures:
- Adamant (+Attack, -Sp. Atk)
- Jolly (+Speed, -Sp. Atk)
You’ll want to avoid lowering Attack here.
Special Attackers
Examples: Alakazam, Starmie, Jolteon
Best Natures:
- Modest (+Sp. Atk, -Attack)
- Timid (+Speed, -Attack)
Lowering Attack is usually fine since they rarely use physical moves.
Defensive Pokémon
Examples: Blastoise, Cloyster
Best Natures:
- Bold (+Defense, -Attack)
- Calm (+Sp. Def, -Attack)
You’re leaning into survivability here.
Mixed Attackers
Examples: Dragonite
Trickier. You’ll want to decide whether you’re focusing physical or special and pick accordingly.
Do Natures Affect Catching or Evolution?
No.
Natures:
- Do not affect catch rate.
- Do not change evolution.
- Do not change base stats.
- Do not affect move learnsets.
They only influence stat growth as the Pokémon levels up.
Can You Change a Pokémon’s Nature in FireRed & LeafGreen?
Short answer: No.
There are no mints, no breeding manipulation tools like in modern games and no ways to adjust Nature once assigned.
If you want a specific Nature, you’ll need to:
- Catch multiple versions of the same Pokémon.
- Check their summary screen.
- Keep the one with the Nature you want.
Yes, this can be grindy. But if you’re preparing for the Elite Four or postgame rematches, it’s worth it.
Should Casual Players Care About Natures?
If you’re just playing through the story casually, not really.
But if you:
- Want the strongest possible team
- Are doing rematches
- Care about efficiency
- Plan to trade or battle competitively
Then yes, Natures absolutely matter.
That 10% boost can be the difference between outspeeding Lance’s Dragonite or getting knocked out first.
Final Thoughts
Pokémon Natures in FireRed and LeafGreen are subtle but powerful. They don’t scream for attention, but they quietly shape how strong your Pokémon becomes over time.
If you’re serious about building a strong team, don’t ignore them.
Check your Nature.
Know what stat it boosts.
Make sure it aligns with your Pokémon’s role.
Because sometimes, the difference between a good Pokémon and a great one is just 10%.
Pokémon FireRed & LeafGreen Natures Frequently Asked Questions
Do Natures really matter in FireRed and LeafGreen?
Yes, especially if you care about building a strong team. A Nature increases one stat by 10% and decreases another by 10%, which becomes noticeable at higher levels. For casual story playthroughs it’s not critical, but for Elite Four rematches or optimized teams, it absolutely makes a difference.
Can you change a Pokémon’s Nature in FireRed and LeafGreen?
No. Once a Pokémon’s Nature is assigned, it cannot be changed in Generation III games. There are no mints or stat-altering items like in modern Pokémon titles. If you want a specific Nature, you’ll need to catch or breed for it.
How do you check a Pokémon’s Nature?
Open your Pokémon’s summary screen. The Nature will be listed directly in its profile information. It will also subtly hint at which stat grows faster based on the description.
Does Nature affect HP?
No. Natures never increase or decrease HP. They only affect Attack, Defense, Special Attack, Special Defense or Speed.
What are the best Natures in FireRed and LeafGreen?
It depends on the Pokémon’s role:
- Physical attackers often prefer Adamant or Jolly.
- Special attackers usually benefit from Modest or Timid.
- Defensive Pokémon commonly prefer Bold or Calm.
The key here is matching the Nature to how you plan to use the Pokémon.
Are neutral Natures bad?
Not necessarily. Neutral Natures like Hardy, Docile, Serious, Bashful and Quirky don’t modify stats at all. They aren’t optimal for competitive builds, but they also won’t hurt your Pokémon’s growth.
Does Nature affect catching Pokémon?
No. Nature has no impact on catch rates, evolution methods or move learnsets. It strictly affects stat growth.
Is Speed the most important stat to boost with Nature?
Speed is extremely valuable in FireRed and LeafGreen because going first often determines the outcome of a battle. Natures like Jolly or Timid are popular for this reason. However, it still depends on the Pokémon’s intended role.
Should you reset for a good Nature starter Pokémon?
If you’re min-maxing or planning postgame challenges, yes. Many players soft reset at the start to get a favorable Nature on Charmander, Bulbasaur or Squirtle. If you’re playing casually, it’s not required.