Question

If you click this link http://pokemondb.net/sprites/pikachu , you will see that from Gen IV onwards female Pikachu have "dents" in their tails. However, it does not show it in the sprites for Gen III games. Was the concept introduced in Gen IV or something?

Answer 1

Yes, it has always been like that.
to separate genders from each other.
But The male Does not have it. if you take a look
at Ash's Picachu you should see the difference.

Male: Female:

This link Should show
Hope I helped :)

Comments

I ment to put a comma after show sorry ;)

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Did you notice the 'edit' button next to the 'comment' button?

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lol SHadow Lucario

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no i didn't

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I know that males don't have it, i just wanted to know if the concept of females having it was created from the beginning or if it was introduced in Gen V thx though :)

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The difference only shows starting in Gen IV, not all the games.