- Nature of Pokémon - IVs of Pokémon - What EVs are already in the Pokémon (if previously trained) - Where to find Pokémon that give off EVs needed
Pros to EV Training:
- The Pokémon will be much stronger than a Pokémon that is not EV'd - You may find rares in the process as you will be spending much time in one area - Earn easy money - Gives you a competitive edge in PvP
Cons to EV Training:
- Time consuming - It is easy to lose track of EVs if you are going for the perfect 252 EVs - Errors may sometimes cause loss or miscalculation of EVs
An example of EV Training:
Bailey catches a Growlithe. He checks its nature and it is Adamant. This nature increases attack and decreases special attack. Bailey checks the IVs of Growlithe and sees that attack and speed have high IVs, so he decides he wants to EV Train it. Bailey searches for Pokémon that give off attack EVs first. After determining that Sentret gives off an attack EV, Bailey kills 252 Sentrets and is finished EV'ing in attack. Bailey then determines that Starly gives a speed EV, and so he searches for and kills 252 Starlys and is finished EV'ing in speed. Bailey then sees he can boost a stat by 1 point with 6 EVs left, so he sees that Hoothoot gives HP. Bailey kills 6 Hoothoots for an extra point in the HP stat. Bailey then continues to level up Growlithe afterwards and notices its growth in these stats, as well as how much stronger it is than other Growlithes.
NOTE: Another way to EV Train is to buy many of the EV Berry items. This is a rather expensive method to EV Train but it eliminates virtually all of the fighting needed that normal EV Training requires.