The Pokémon Company has announced that the Pokédex for iOS app will be available for free on the Apple App Store starting July 13th, 2013. The app initially only features the Unova dex but the price for the other regions add-ons has decreased to $3.99 each.

Pokédex for iOS - Free

Now’s the perfect time to pick up the Pokédex for iOS app!

Browse and research all of the Unova Pokémon on your iPhone, iPod touch, or iPad for free with the Pokédex for iOS application! Starting on July 13th, get Pokédex for iOS, including info on every known Unova region Pokémon, for free for a limited time. It’s also a great time to purchase additional regions for your Pokédex for iOS app—each additional region is discounted to $3.99, down from the regular $5.99.

Remember, the Pokédex for iOS app will be free for only a limited time starting on July 13th in the Apple App Store. Don’t miss this awesome opportunity!

Source: http://www.pokemon.com/us/pokemon-news/vg_pokedexforios_free_promo-2013-07-10/

I guess sales for this app aren't too good. Who would have thought no one wants to buy a PokeDex for that price when there are better free alternatives.