SERIOUS NATURE CALCULATOR
Natures weren't part of the series until Generation III (Ruby & Sapphire), so Yellow doesn't have them. Every stat is calculated from base stats, IVs (called DVs back then), and Stat Experience alone. If you're looking for the Serious nature's stat effect, switch the game filter above to any Gen III or later title. That said, the concept still helps with planning teams for remakes like FireRed & LeafGreen or HeartGold & SoulSilver, where natures do apply.
Best Natures for Speed Pokemon
Serious keeps every stat at 1x. No boost, no drop. That might sound safe, but you're giving up a free 10% in the stat that matters most. Nature Mints (Gen 8+) make it easy to fix. Yellow predates the nature system entirely. Transfer forward to apply natures.
Serious is a neutral nature with no stat change. For speed pokemon, use Jolly or Timid instead.
Jolly
+Speed/-Sp. Attack
Max Speed for physical attackers
Timid
+Speed/-Attack
Max Speed for special attackers
| # | Pokemon | Nature | Tier | Role | Ability | Spe |
|---|---|---|---|---|---|---|
| 1 |  Mewtwo PSYCHIC | Timid | S | Special Attacker | Pressure | 130 |
| 2 |  Starmie WATERPSYCHIC | Timid | B | Special Attacker | Analytic | 115 |
| 3 |  Gengar GHOSTPOISON | Timid | B | Special Attacker | Levitate | 110 |
| 4 |  Zapdos ELECTRIC | Timid | B | Special Attacker | Pressure | 100 |
| 5 |  Alakazam PSYCHIC | Timid | B | Special Attacker | Magic Guard | 120 |
| 6 |  Aerodactyl ROCK | Jolly | B | Physical Attacker | Rockhead | 130 |
| 7 |  Tentacruel WATERPOISON | Timid | B | Bulky Support | Raindish | 100 |
| 8 |  Mew PSYCHIC | Jolly | B | Bulky Support | Synchronize | 100 |
| 9 |  Jolteon ELECTRIC | Timid | B | Special Attacker | Voltabsorb | 130 |
| 10 |  Cloyster WATERICE | Jolly | B | Physical Attacker | Skilllink | 70 |
| 11 |  Kadabra PSYCHIC | Timid | C | Special Attacker | Magic Guard | 105 |
| 12 |  Dodrio NORMAL | Jolly | C | Physical Attacker | Earlybird | 110 |
| 13 |  Dugtrio GROUND | Jolly | C | Physical Attacker | Arenatrap | 120 |
| 14 |  Poliwag WATER | Jolly | C | Utility | Waterabsorb | 90 |
| 15 |  Nidoking POISONGROUND | Timid | C | Special Attacker | Sheerforce | 85 |
| 16 |  Mr. Mime PSYCHICFAIRY | Timid | C | Special Attacker | Soundproof | 90 |
| 17 |  Horsea WATER | Timid | C | Utility | Sniper | 60 |
| 18 |  Ninetales FIRE | Timid | C | Special Attacker | Drought | 100 |
| 19 |  Meowth NORMAL | Jolly | C | Physical Attacker | Technician | 90 |
| 20 |  Vulpix FIRE | Timid | D | Utility | Drought | 65 |
Aerodactyl
ROCK
Tentacruel
WATER POISON
SERIOUS NATURE GUIDE
Serious is a neutral nature — no stat is increased or decreased.
Competitive Role
No competitive advantage. A stat-boosting nature is almost always preferred.
How to Get
SynchronizeLead with a Serious Pokemon that has the Synchronize ability. Wild Pokemon will match its nature. (Gen 3+)
BreedingGive the parent with Serious nature an Everstone. The offspring will inherit it. (100% since Gen 5)
Nature MintUse a Serious Mint to change stat effects to Serious. The original nature name stays but stats change. (Gen 8+)
Recommended Alternatives
SERIOUS FAQs
What does the Serious nature do in Pokemon?
Nothing, basically. Serious doesn't change any stat. There's no boost and no penalty. Your Pokemon keeps its base stat spread exactly as-is.
Is Serious nature good?
There's no competitive reason to keep Serious. A 10% stat boost from any other nature is free power you're leaving on the table. Nature Mints (Gen 8+) let you change it without breeding.
How do I get a Serious nature Pokemon?
Catch a Pokemon and check. There's a 4% chance of any specific nature, including Serious. Synchronize ability matches the lead Pokemon's nature to wild encounters (Gen 3+). Everstone passes a parent's nature during breeding.
When should you use a neutral nature?
Almost never. The only edge case is a Pokemon that uses physical moves, special moves, and needs every defensive stat and Speed. That Pokemon doesn't really exist in competitive. Even mixed attackers prefer Naive, Hasty, or another nature that at least boosts Speed.