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Base Stats Structure

by Arty2

Introduction

Each Pokémon has some preset base stats, that determine its potential and power. It has also at least one preset type, a catch rate, gender, EP yield etc.

If you have something to add feel free to comment and I’d be happy to see people contributing to these articles. After every article will follow some related links that will help you get additional information.

Some might notice that the following article looks like Bulbapedia’s related page; I started that one page and fellow Bulbapedia editors are free to take more details from this one article and add it to Bulbapedia. Most stuff is self-explicatory but let’s get into detail.

Specs.

A base stats structure is a 28-byte piece of data in the Advanced Generation games.

Base Stats Structure
Data  Type  Description
Base HP byte The Pokémon’s base HP used to calculate its stats.
Base Attack byte The Pokémon’s base Attack used to calculate its stats.
Base Defense byte The Pokémon’s base Defense used to calculate its stats.
Base Speed byte The Pokémon’s base Speed used to calculate its stats.
Base Special Attack byte The Pokémon’s base Special Attack used to calculate its stats.
Base Special Defense byte The Pokémon’s base Special Defense used to calculate its stats.
Type 1 byte The first Type of Pokémon of the species.
Type 2 byte The second Type of Pokémon of the species. Matches the first if it only has one Type.
Catch Rate byte The Catch Rate used to calculate the probability of catching a wild Pokémon of that species. The higher the value is, the easier it is to capture the Pokémon.
Base EXP byte The Base Experience used when calculating the gained EXP. Points when defeating a Pokémon of that species.
Effort Points yield word The amount and type of Effort Points gained when defeating a Pokémon of that species.
Held Item 1 word Wild Held Item number 1 with a Probability of 50%.
Held Item 2 word Wild Held Item number 2 with a Probability of 5%. When this value matches with the previous one, then the Probability is 100%.
Gender byte The value that determines a Pokémon’s gender. It represents the rate of females versus males of the species. 0x255 is Genderless, 0x254 is 100% female and 0 is 100% male.
Base Egg Steps byte Determines the number of steps that must be taken before an Egg of the species hatches. ActualEggSteps = BaseEggSteps*256.
Base Tameness byte The tameness value of a Pokémon of that species has when caught/traded.
Growth Group byte This value determines how fast a Pokémon of that species will level up.
Egg Group 1 byte The first Egg Group a Pokémon of the species belongs to.
Egg Group 2 byte The second Egg Group a Pokémon of the species belongs to. Matches the first if it only belongs to one Egg Group.
Ability 1 byte The first Ability a Pokémon of the species may have.
Ability 2 byte The second Ability a Pokémon of the species may have. If none then the value equals 0.
Safari Zone Flag byte Determines rate at which Pokémon of the species flee when encountered in the Safari Zone. Only Pokémon that appear in the Safari Zone have this flag.
Color byte The Pokémon’s Pokédex color.
Padding word Always equals 0000. It is used as a divider/padding between the data entries.

Additional References

Types (decimal)

00  Normal      09  ???
01  Fighting    10  Fire
02  Flying      11  Water
03  Poison      12  Grass
04  Ground      13  Electric
05  Rock        14  Psychic
06  Bug         15  Ice
07  Ghost       16  Dragon
08  Steel       17  Dark

Effort Points Yield (word/bytes reversed)

0000   11     11     11   11   11   11    (binary)
empty  SPDEF  SPATK  SPD  DEF  ATK  HP

Gender

x = ♀, y = ♂, n = gender value
x = floor(n/254)*100
y = 100 - x

Growth Group (decimal)

0   1,000,000   Medium-Fast
1     600,000   Erratic
2   1,640,000   Fluctuating
3   1,059,860   Medium-Slow
4     800,000   Fast
5   1,250,000   Slow

Egg Groups (decimal)

01  Monster   09  Water 3
02  Water 1   10  Mineral
03  Bug       11  Inteterminate
04  Flying    12  Water 2
05  Ground    13  Ditto
06  Fairy     14  Dragon
07  Plant     15  No Eggs
08  Humanshape

Color

0  Red     5  Brown
1  Blue    6  Purple
2  Yellow  7  Gray
3  Green   8  White
4  Black   9  Pink

Related links

About the author

Arty2

Heracles is an Athens-based architect and designer.
He founded LegendaryPKMN in 2001.

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