From Bulbapedia, the community-driven Pokémon encyclopedia.
Like previous major releases, especially those that set a new generation, Pokémon Black and White went through multiple development stages, many of which included several elements that were eventually dropped or revised before the games' release. Some of these components can still be found within their internal data.
The prototype starter
The sprite used in the starter selection screen for Tepig is different in some early videos. The prototype sprite has a more triangular hind foot, with only one being visible on the sprite, and slightly different shading. Also, the silhouettes of the unselected starters are lighter compared to the final.
Early VS sprites for Hilbert and Cheren can be seen in an early video which was broadcasted on Pokémon Sunday. Whilst Cheren's VS sprite had a minor alteration with where his eyes are looking, Hilbert's sprite received a complete overhaul. An early VS sprite for Bianca, lacking her Xtransceiver, was shown in the early video footage that came with an issue of Dengeki Nintendo DS.
In Excadrill's first appearance in a promotional video, its stripes were mirrored. However, this was not long-lived, as it was changed to its current appearance in the next video.
In some early footage of Route 4, The Dreamyard can be heard playing instead of the correspondent seasonal variant of Route 4.
Some retailers in the United Kingdom (specifically GAME and Gamestation) used pre-release box art using the name Alleos for the region as opposed to its final English name, Unova. This name was also used at pre-release and post-release demo events in the United Kingdom.
In several pre-release screenshots and video footage, Castelia City's texture is noticeably different from the final version, with at least four different variations seen before the final release.
Image released on April 15, 2010
Footage from the June 27, 2010 trailer that was broadcasted on Oha Suta
Image from a Pokemon.co.jp video
Image released on May 14, 2010
Another image from a Pokemon.co.jp video
Pre-release screenshots of Chargestone Cave show rocks lying around the cave to be of a different shape and having a darker tone with less glow compared to the final version.
On an early screenshot of within Skyarrow Bridge, a female Backpacker can be seen. This Backpacker was replaced by an Ace Trainer in the final release. However, in Pokémon Black 2 and White 2, exactly the same spot is occupied by a Backpacker, just like in the screenshot. In addition, two pre-release screeshots of Skyarrow Bridge depict a slightly different skyline of Castelia City.
When buying items at a Pokémon Center, the part of the screen where the player can be seen is rotated.
On early videos of Dream World, a Pikachu could be seen being encountered in the game and also later at Entree Forest indicating that it had been befriended. In the final versions, Pikachu cannot be encountered in any location in-game or in the Dream World, and the only way to catch one is transferring via the Poké Transfer.
Since the engine that powers the games is improved upon that of the Generation IV games, all items from Generation IV, including Poké Balls, Key Items and unused items, are present in the internal data, with the exception of HM07 and HM08, which are now blank space "?" items. However, most of these items are unobtainable. Other leftover items, like the God Stone, are specific to Pokémon Black and White and can be likewise obtained through modification of the saved game or cheating.
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If the player uses the "walk through walls" cheat, enters the P2 Laboratory and keeps walking down, there will be an untextured room with a few tables in it.
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Several lines of unused weather effect text appear within the internal data of Black, White, Black 2, and White 2. Notably, quotes for fog exist within the text, implying that fog functionality was planned to exist in Black and White. While the final game does include foggy locations, such as Route 15, the fog weather condition does not appear in battles.
| Fog crept up as thick as soup!
| The fog lifted.
| The sandstorm rages.
| The hail crashes down.
The game will freeze at random intervals and prevent Pokémon from gaining experience points if it detects it is being played on an emulator or flash cart making progressing in the game past a certain level impossible.