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Icon137 #137: Sylveon
Pokémon
#139: Ratsy Icon139
Icon138
Nucleon
Atomic Pokémon
#138
119 Nucleon
Type
Nuclear
Unknown
Unknown
Ability
Atomizate
Hidden Ability
Geiger Sense
Gender ratio
87.5% male, 12.5% female
Catch rate
45 (5.9%)
Breeding
Egg group
Field
Hatch time
9180 steps*
Height
0.7 m
m
Weight
21.5 kg lbs
{{{weight2-kg}}} kg
Base experience yield
184
Leveling rate
Medium Fast
EV yield
Total: 2
0
HP
0
Atk
0
Def
1
Sp.Atk
1
Sp.Def
0
Speed
0
HP
0
Atk
0
Def
0
Sp.Atk
0
Sp.Def
0
Speed
Body style
Body08
Footprint
File:F138.png
Pokédex color
Black
Base friendship
35
Cry


Nucleon is a Nuclear-type Pokémon.

It evolves from Eevee starting at level 20 while the player has a Nuclear-type Pokémon in their party.

Pokédex entry

Pokédex entry
One of the only non-feral Nuclear Pokémon. It's theorized that its bond with its trainer when it was an Eevee allows it to stay in control.

Biology

Physiology

Nucleon has a sleek gray body with four slender legs, each with a green three-toed paw. It has three light-blue eyes. Its muzzle and underbelly are white, and its tail and ears are slender green triangles detatched from its body. It has an ionising radiation symbol on its chest with three detatched green triangles, giving it the appearance of a bow-tie.

Special abilities

Nucleon remembers the bond it had with its trainer and thus does not go feral upon evolution from an Eevee. The symbol on its chest can also fire out gamma rays which it defeats its opponents with.

Behavior and Habitat

They are usually only found in urban areas under the care of trainers, though they can be occasionally seen roaming near irradiated landscape.

Game locations

Availability
None Evolve Eevee
Common
Uncommon
Fossil
Rare
Poké Radar
One

Held items

Held item(s)
None This Pokémon cannot be found holding an item.
Common
Uncommon
Rare
Always

Base stats

Stat Range
At Lv. 50 At Lv. 100
HP: 70
130 - 177 250 - 344
Attack: 55
54 - 117 103 - 229
Defense: 85
81 - 150 157 - 295
Sp.Atk: 115
108 - 183 211 - 361
Sp.Def: 115
108 - 183 211 - 361
Speed: 90
85 - 156 166 - 306
Total: 530   Other Pokémon with this total  
  • Minimum stats are calculated with 0 EVs, IVs of 0, and a hindering nature, if applicable.
  • Maximum stats are calculated with 252 EVs, IVs of 31, and a helpful nature, if applicable.


Type effectiveness

Under normal battle conditions, this Pokémon is:
Immune to:
Normal
Fighting
Flying
Poison
Ground
Rock
Bug
Ghost
Steel
Fire
Water
Grass
Electric
Psychic
Ice
Dragon
Dark
Fairy
Nuclear ½×
None
Doubly resistant to:
Normal
Fighting
Flying
Poison
Ground
Rock
Bug
Ghost
Steel
Fire
Water
Grass
Electric
Psychic
Ice
Dragon
Dark
Fairy
Nuclear ½×
None
Resistant to:
Normal
Fighting
Flying
Poison
Ground
Rock
Bug
Ghost
Steel
Fire
Water
Grass
Electric
Psychic
Ice
Dragon
Dark
Fairy
Nuclear ½×
None
Damaged normally by:
Normal
Fighting
Flying
Poison
Ground
Rock
Bug
Ghost
Steel
Fire
Water
Grass
Electric
Psychic
Ice
Dragon
Dark
Fairy
Nuclear ½×
None
Weak to:
Normal
Fighting
Flying
Poison
Ground
Rock
Bug
Ghost
Steel
Fire
Water
Grass
Electric
Psychic
Ice
Dragon
Dark
Fairy
Nuclear ½×
None
Doubly weak to:
Normal
Fighting
Flying
Poison
Ground
Rock
Bug
Ghost
Steel
Fire
Water
Grass
Electric
Psychic
Ice
Dragon
Dark
Fairy
Nuclear ½×
None

Moves

By leveling up

By leveling up
 Level   Move   Type   Cat.   Pwr.   Acc.   PP 
Start Helping Hand Normal Status —% 20
Start Tackle Normal Physical 50 100% 35
Start Tail Whip Normal Status 100% 30
5 Sand-Attack Ground Status 100% 15
9 Gamma Ray Nuclear Special 40 100% 30
12 Quick Attack Normal Physical 40 100% 30
17 Swift Normal Special 60 —% 20
21 Headbutt Normal Physical 70 100% 15
25 Half-Life Nuclear Special Varies 90% 10
29 Flash Normal Status —% 20
33 Mirror Coat Psychic Special 100% 20
37 Conversion 2 Normal Status —% 20
41 Last Resort Normal Physical 140 100% 5
45 Hyper Voice Normal Special 90 100% 10
  • A level of "Start" indicates a move that will be known by a Nucleon obtained at level 1
  • Bold indicates a move that gets STAB when used by Nucleon
  • Italic indicates a move that gets STAB only when used by an evolution of Nucleon

Via a prior evolution

Via a prior evolution
 Stage   Move   Type   Cat.   Pwr.   Acc.   PP 
Icon129 Growl Normal Status 100% 40
Icon129 Bite Dark Physical 60 100% 25
Icon129 Take Down Normal Physical 90 85% 20
Icon129 Charm Fairy Status 100% 20
Icon129 Baton Pass Normal Status —% 40
Icon129 Double-Edge Normal Physical 120 100% 15
Icon129 Trump Card Normal Special Varies —% 5
Icon129 (through TM) Dig Ground Physical 80 100% 10
Icon129 (through TM) Shadow Ball Ghost Special 80 100% 15
  • Bold indicates a move that gets STAB when used by Nucleon
  • Italic indicates a move that gets STAB only when used by an evolution of Nucleon

By TM/HM

By TM/HM
 TM   Move   Type   Cat.   Pwr.   Acc.   PP 
TMPsychic TM04 Calm Mind Psychic Status 0000 —}}—% 20
TMNormal TM05 Roar Normal Status 0000 100}}100% 20
TMPoison TM06 Toxic Poison Status 0000 090}}90% 10
TMNormal TM10 Hidden Power Normal Special 0000Varies 100}}100% 15
TMFire TM11 Sunny Day Fire Status 0000 —}}—% 5
TMNormal TM15 Hyper Beam Normal Special 150150 090}}90% 5
TMPsychic TM16 Light Screen Psychic Status 0000 —}}—% 30
TMNormal TM17 Protect Normal Status 0000 —}}—% 10
TMWater TM18 Rain Dance Water Status 0000 —}}—% 5
TMNormal TM20 Safeguard Normal Status 0000 —}}—% 25
TMNormal TM21 Frustration Normal Physical 0000Varies 100}}100% 20
TMNormal TM27 Return Normal Physical 0000Varies 100}}100% 20
TMNormal TM32 Double Team Normal Status 0000 —}}—% 15
TMPsychic TM33 Reflect Psychic Status 0000 —}}—% 20
TMNormal TM42 Facade Normal Physical 07070 100}}100% 20
TMPsychic TM44 Rest Psychic Status 0000 —}}—% 10
TMNormal TM45 Attract Normal Status 0000 100}}100% 15
TMNormal TM64 Explosion Normal Physical 250250 100}}100% 5
TMNormal TM68 Giga Impact Normal Physical 150150 090}}90% 5
TMNormal TM70 Flash Normal Status 0000 100}}100% 20
TMNormal TM82 Sleep Talk Normal Status 0000 —}}—% 10
TMNormal TM87 Swagger Normal Status 0000 090}}90% 15
TMNormal TM90 Substitute Normal Status 0000 —}}—% 10
  • Bold indicates a move that gets STAB when used by Nucleon
  • Italic indicates a move that gets STAB only when used by an evolution of Nucleon

By tutoring

By Move Tutor
 Move   Type   Cat.   Pwr.   Acc.   PP   Cost 
Helping Hand Normal Status —% 20 Bag Yellow Shard Sprite4
Hyper Voice Normal Special 90 100% 10 Bag Blue Shard Sprite4
Covet Normal Physical 60 100% 25 Bag Red Shard Sprite4
  • Bold indicates a move that gets STAB when used by Nucleon
  • Italic indicates a move that gets STAB only when used by an evolution of Nucleon

By breeding

By breeding
 Father   Move   Type   Cat.   Pwr.   Acc.   PP 
Icon029Icon030Icon031 Captivate Normal Status 100% 20
Icon103Icon104 Curse Ghost Status —% 10
Icon067Icon068 Detect Fighting Status —% 5
Icon022Icon023 Endure Normal Status —% 10
N/A Fake Tears Dark Status 100% 20
Icon022Icon023 Flail Normal Physical Varies 100% 15
Icon139Icon140 Natural Gift Normal Physical Varies 100% 15
Icon139Icon140 Stored Power Psychic Special 20 100% 10
Icon139Icon140 Synchronoise Psychic Special 70 100% 15
N/A Tickle Normal Status 100% 20
Icon139Icon140 Wish Normal Status —% 10
Icon022Icon023 Yawn Normal Status —% 10
  • Moves marked with an asterisk (*) must be chain bred onto Nucleon
  • Bold indicates a move that gets STAB when used by Nucleon
  • Italic indicates a move that gets STAB only when used by an evolution of Nucleon

Evolution

129
Unevolved
Eevee
 Normal 
Bag Rare Candy Sprite
Level up with
Nuclear party member
138
First evolution
Nucleon
 Nuclear 

Sprites

Front Back
GenderM 138 138b
Front shiny Back shiny
GenderM 138s 138sb

Trivia

  • Nucleon does not share the same stat spread or base stat total with the other Eeveelutions. It has a base stat total of 530 (as opposed to 525), and its stat spread is 70/55/85/115/115/90 (as opposed to some combination of 60/65/65/95/110/130).
  • Nucleon uses Glaceon's cry.
  • Nucleon is the first Nuclear Pokémon listed in the PokéDex, as Nuclear forms are not listed.
    • Ironically, it is impossible for Nucleon to be the first Nuclear Pokémon a player has interacted with besides trading-Theo only acquires one after Vinoville Town, and the player cannot have a Nucleon without first catching another Nuclear Pokémon themselves.
    • Nucleon is also the only Nuclear-type capable of having its Hidden Ability.

Design origin

Nucleon shares characteristics with foxes (especially the fennec fox), cats, and dogs. On Nucleon's chest is the international warning symbol for ionizing radiation. Nucleon has a third eye on its forehead, a characteristic mutants are often depicted with in fiction.

Name origin

Nucleon comes from nuclear, nucleus (the center of an atom), or nucleon (one of the particles found in the nucleus) as well as Eon (an immeasurably long period of time, presumably in reference to the concept of evolution). Eon is also a suffix shared by all Eeveelutions and was Eevee's prototype English name.

Icon129
Eevee
Icon130
Vaporeon
Icon131
Jolteon
Icon132
Flareon
Icon133
Espeon
Icon134
Umbreon
Icon135
Leafeon
Icon136
Glaceon
Icon137
Sylveon
Icon138
Nucleon
Icon137 #137: Sylveon
Pokémon
#139: Ratsy Icon139