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'''Effort values''' (abbreviated '''EVs''' and previously called '''Stat Exp'''), officially called '''base stats''' (Japanese: '''{{tt|基礎|きそ}}ポイント''' ''base point''), are attributes which give bonuses to an individual Pokémon's [[stats]] and improve differently depending which Pokémon they defeat. These bonuses, in the form of effort points, are gained in addition to bonuses gained by increasing level. A Pokémon which increases in level using a {{DL|Vitamin|Rare Candy}} instead of battling does not gain any EVs, making it somewhat weaker than a Pokémon who increases in level by battling and acquiring EVs; this is also one of the reasons [[Caught Pokémon|trained Pokémon]] are stronger than their [[wild Pokémon|wild counterparts]], even those of the same [[level]].
'''Effort values''' (Japanese: '''{{tt|努力値|どりょくち}}''' ''effort values''), abbreviated EVs and officially called '''base stats''' (Japanese: '''{{tt|基礎|きそ}}ポイント''' ''base point''), are attributes which give bonuses to an individual Pokémon's [[stats]] and improve differently depending which Pokémon they defeat.
 
In the context of [[Generation I|Generations I]] and {{gen|II}}, the effort value system is known as '''Stat Experience''', or "Stat Exp." for short.
 
==Details==
Effort values, in the form of effort points, are gained in addition to bonuses gained by increasing level. A Pokémon which increases in level using a {{DL|Vitamin|Rare Candy}} instead of battling does not gain any EVs, making it somewhat weaker than a Pokémon who increases in level by battling and acquiring EVs; this is also one of the reasons [[Caught Pokémon|trained Pokémon]] are stronger than their [[wild Pokémon|wild counterparts]], even those of the same [[level]].


Roughly speaking, defeating fast Pokémon increases Speed better than fighting slow Pokémon, defeating Pokémon with high hit points improves HP more than defeating Pokémon with low HP, and so on. For example, fighting 100 {{p|Machop}} will improve a Pokémon's Attack stat more than fighting 100 {{p|Abra}} of the same level, whereas the Abra will improve the Special Attack stat more.
Roughly speaking, defeating fast Pokémon increases Speed better than fighting slow Pokémon, defeating Pokémon with high hit points improves HP more than defeating Pokémon with low HP, and so on. For example, fighting 100 {{p|Machop}} will improve a Pokémon's Attack stat more than fighting 100 {{p|Abra}} of the same level, whereas the Abra will improve the Special Attack stat more.


Effort points are awarded equally to all Pokémon who participated in defeating a Pokémon. Though they are shared, each of the Pokémon will receive the standard amount of effort points.
Effort points are awarded equally to all Pokémon who participated in defeating a Pokémon. Though they are shared, each of the Pokémon will receive the standard amount of effort points.
In [[Generation I]] and [[Generation II]], effort points given are equal to the [[base stats]] of the defeated Pokémon species. For a list of the effort points that Pokémon give away on their defeat in [[Generation III]] and later, see [[list of Pokémon by effort value yield]].


Gaining effort points to increase desired EVs varies from being simple to complicated, depending on whether one wants their Pokémon to fully max out its stats or raise them to balanced heights. Should a Pokémon attain the maximum amount of 510 effort points, it will be eligible to receive an {{DL|List of Ribbons in the games|Effort Ribbon}} to signify this achievement ([[Generation III]], {{gen|IV}} and {{gen|VI}}).
Gaining effort points to increase desired EVs varies from being simple to complicated, depending on whether one wants their Pokémon to fully max out its stats or raise them to balanced heights. Should a Pokémon attain the maximum amount of 510 effort points, it will be eligible to receive an {{DL|List of Ribbons in the games|Effort Ribbon}} to signify this achievement ([[Generation III]], {{gen|IV}} and {{gen|VI}}).
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==Stat Experience==
==Stat Experience==
In [[Generation I|Generations I]] and {{gen|II}}, effort points given are equal to the [[base stats]] of the defeated Pokémon species.
The [[Pokémon data structure in the GB|Pokémon data structure]] contains two EV bytes for each of the five stats (HP, Attack, Defense, Speed and Special), starting at zero when caught and with a maximum EV of 65535 for each stat. When a Pokémon is defeated, its [[base stats]] are converted to effort points and then added to the EVs. For example, defeating a {{p|Mew}} grants 100 effort points to each EV. (Defeating 656 {{p|Mew}}, therefore, will give a Pokémon maximum EVs in each stat.)
The [[Pokémon data structure in the GB|Pokémon data structure]] contains two EV bytes for each of the five stats (HP, Attack, Defense, Speed and Special), starting at zero when caught and with a maximum EV of 65535 for each stat. When a Pokémon is defeated, its [[base stats]] are converted to effort points and then added to the EVs. For example, defeating a {{p|Mew}} grants 100 effort points to each EV. (Defeating 656 {{p|Mew}}, therefore, will give a Pokémon maximum EVs in each stat.)


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At level 100, the formula for determining the stat difference between a Pokémon trained in that stat and an untrained Pokémon is [[File:EV Formula GenI.png|114px]].
At level 100, the formula for determining the stat difference between a Pokémon trained in that stat and an untrained Pokémon is [[File:EV Formula GenI.png|114px]].


===Generation I===
The EV system was introduced in [[Generation I]], where it was also called '''Stat Experience''' or '''Stat Exp'''.
===Generation II===
EVs behave the same in [[Generation II]] as they did in [[Generation I]]. Both Special Attack and Special Defense share the EV for Special to maintain compatibility. The amount of Special EVs received is equal to the defeated Pokémon's Special Attack base stat. The [[box trick]] can still be used.
EVs behave the same in [[Generation II]] as they did in [[Generation I]]. Both Special Attack and Special Defense share the EV for Special to maintain compatibility. The amount of Special EVs received is equal to the defeated Pokémon's Special Attack base stat. The [[box trick]] can still be used.


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