Effort Values, or EVs for short are hidden points which are earned when defeating a Pokémon. These points give bonuses to a specific stat. When leveling up via battling a Pokémon gains the bonuses in addition to the normal stat bonuses. When leveling using a Rare Candy, Pokémon do not gain any EV points and are thus weaker than a Pokémon which battled to level up.
In total a Pokémon may have up to 510 EV points. These can be divided up in anyway you like. There is a limit though, each stat can only have 255 EV points in total.
For instace the EV's can be divided into any of the following and more.
| Stat |
EVs |
| HP |
0 |
| Atk |
123 |
| Def |
123 |
| Spe |
200 |
| SpA |
64 |
| SpD |
0 |
|
| Stat |
EVs |
| HP |
4 |
| Atk |
252 |
| Def |
254 |
| Spe |
0 |
| SpA |
0 |
| SpD |
0 |
|
| Stat |
EVs |
| HP |
0 |
| Atk |
0 |
| Def |
0 |
| Spe |
255 |
| SpA |
255 |
| SpD |
0 |
|
Ev's can be aplied in any combination, so long as it meets 510 or below.
The following Pokémon are recommended for EV training against because they are easy or easy to find;
| Pokémon |
Location |
EVs given |
| Attack |

Seaking |
Route 42 (Surfing) |
2 Atk |

Seaking |
Route 42 (Surfing) |
1 Atk |
| Defence |

Graveler |
Route 45 |
2 Def |

Skarmory
(SS Only) |
Route 45 |
2 Def |

Gliger (HG Only) |
Route 45 |
1 Def |

Geodude |
Route 45 |
1 Def |

Graveler |
Victory Road (All Floors) |
2 Def |

Onix
|
Victory Road (All Floors) |
1 Def |

Rhyhorn
|
Victory Road (All Floors) |
1 Def |

Bronzor (Using Sinnoh Sounds) |
Victory Road (All Floors) |
1 Def |
| Special Attack |

Flaaffy |
Route 43 |
2 SpA |

Girafarig |
Route 43 |
2 SpA |

Mareep
|
Route 43 |
1 SpA |
 Golduck |
Ilex Forest (Surfing) |
2 SpA |

Psyduck |
Ilex Forest (Surfing) |
1 SpA |
| Special Defence |

Tentacruel
|
Route 34 (Surfing) |
2 SpD |

Tentacool
|
Route 34 (Surfing) |
1 SpD |

Drowzee
|
Route 34 (Walking) |
1 SpD |

Ditto
|
Route 34 (Walking) |
1 SpD |
| Speed |

Raticate
|
Route 7 |
2 Spe |

Persian (SS Only) |
Route 7 |
2 Spe |

Spearow
(Morning/Daytime Only) |
Route 7 |
1 Spe |

Murkrow
(Night Only) |
Route 7 |
1 Spe |

Meowth
(SS Only) |
Route 7 |
1 Spe |

Vulpix (SS Only) |
Route 7 |
1 Spe |

Rattata |
Route 7 |
1 Spe |

Plusle
(Hoenn Only) |
Route 7 |
1 Spe |

Minun
(Hoenn Only) |
Route 7 |
1 Spe |
| HP |

Quagsire |
Union Cave First Floor, Surfing
Cliff's Edge Gate Surfing |
2 HP |

Wooper |
Union Cave First Floor, Surfing
Cliff's Edge Gate Surfing |
1 HP |

Slowpoke
|
Slowpoke Well First Floor, Surfing |
1 HP |
To get the most from EV training your going to want your Pokémon to have the best nature forthe stat you want to be the highest. Below is a grid for the natures of the Pokémon and what they give.
On top of finding the correct Pokémon to train against for the correct EVs and the correct natures, there are also items that can boost the amount of EV's you earn in a battle. By using these items you can cut your EV training time by half!
| Item Name |
Effect |
Location of Item |
| EV Enhancing Items |

Power Weight |
+4 HP EVs |
Battle Frontier |

Power Bracer |
+4 Attack EVs |
Battle Frontier |

Power Belt |
+4 Defence EVs |
Battle Frontier |

Power Lens |
+4 Special Attack EVs |
Battle Frontier |

Power Band |
+4 Special Defence EVs |
Battle Frontier |

Power Anklet |
+4 Speed EVs |
Battle Frontier |

HP Up |
+10 HP EVs |
Celadon Department Store, Goldenrod Department Store |

Protein |
+10 Attack EVs |
Celadon Department Store, Goldenrod Department Store |

Iron |
+10 Defence EVs |
Celadon Department Store, Goldenrod Department Store |

Calcium |
+10 Special AttackEVs |
Celadon Department Store, Goldenrod Department Store |

Zinc |
+10 Special DefenceEVs |
Celadon Department Store, Goldenrod Department Store |

Carbos |
+10 Speed EVs |
Celadon Department Store, Goldenrod Department Store |
|