Pokémon Black 2 and White 2

Pokémon Black 2 and White 2 are, as you might have surmised, the sequels to Pokémon Black and White, set two years after the first Generation V pair. These games feature a new, less fashion-challenged Team Plasma, a pair of new forms for Kyurem that make it suck much less, and Colress' kick-ass battle theme.

Leftover Key Item Icons
Every Key Item icon Game Freak has made since Generation III is present. Period. Including all the ones that haven't even existed since Generation IV started, including the God Stone.

Pokéstar Studios Placeholders/Unused Palettes
There are several placeholder graphics and unused alternate palettes for props, actors, and movie cutscenes in Pokéstar Studios.

Cutscene Placeholders


Three cutscene placeholder graphics. The first one is of the male player character in his normal clothing, which is never seen in any movies. The other two are negative versions of the male and female character's cutscene portraits.

Shiny Prop


A "shiny" variant of the normal Prop sprite. Like several unused "shiny" sprites in Pokéstar Studios, it's just a silhouette.

UFO


Two placeholder graphics for the UFO. The silhouette is the shiny variant.

White Door


Very early graphics for the White Door. The silhouette is the shiny variant.

Black Door


Two placeholder graphics for the Black Door. The silhouette is the shiny variant.

MT


Two placeholder graphics for the Mecha–Tyranitar (MT). The silhouette is the shiny variant.

MT2


Two placeholder graphics for the Mecha–Tyranitar 2 (MT2). The silhouette is the shiny variant.

Humanoid


Two placeholder graphics for the Humanoid. The silhouette is the shiny variant.

Monster


Two very early placeholder graphics for the Monster boss. The silhouette is the shiny variant.

Transport


Two very early placeholder graphics for the Transport. The silhouette is the shiny variant.

Majin
There are two blank graphics for the Majin boss.

F-00 (1)


Two unused palettes for F-00's first form.

Shiny F-00 (1)


An unused shiny version of F-00's first form.

F-00 (2)


Two unused palettes for F-00's second form.

Shiny F-00 (2)


An unused shiny version of F-00's second form.

Monica (1)


Two placeholder graphics for the first encounter with Monica.

Monica (2)


Two placeholder graphics for the second encounter with Monica.

Black Belt


Two placeholder graphics for the Blackbelt. The silhouette is the shiny variant.

Brycen-Man


Two placeholder graphics for Brycen-Man. These use the Victini sprite with a different palette. The silhouette is the shiny variant.

Pink Smeargle


Two placeholder graphics for the pink Smeargle.

Unused Hidden Abilities
In the Generation V games, it is possible to find Pokémon with special "hidden Abilities", either via the Dream World or Hidden Grottos. However, some Pokémon with hidden Abilities were unable to be found in the Dream World or in Hidden Grottoes, rendering the hidden Abilities unused in normal gameplay.

The new breeding mechanics of the Generation VI games gave Gothita, Rufflet, and Klink their previously-unused hidden Abilities.

Larvesta and Volcarona can now be found with their hidden Ability in the Generation VI games.

Also of note is that Litwick, Lampent, and Chandelure's hidden Ability in the Generation VI games changed from Shadow Tag to Infiltrator. These Pokémon can now be found in the Generation VI games with Infiltrator. Zapdos's hidden Ability was changed to Static in Generation VI, for it can be seen with this Ability in the Battle Maison. However, it still remains unobtainable.

Unused Weather Text
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.

Unused Mom Quotes
There are unused strings of text for inquiring to the player character's mother about his/her current location via the Xtransceiver. Most are locations where the Xtransceiver cannot be used, though one exists for Route 10 (see its own section).

Plasma Frigate
What? The Plasma Frigate? Never heard of it. Should I go have a look and see what it's like?

Entralink
Entralink? I don't know about that... Is there a place like that in the Unova region?

Route 10
Ah, I liked Route 10. There was something lyrical about it...

Royal Unova
The Royal Unova? A cruise ship from Castelia! You're getting pretty fancy! So, which is it going to be? Are you going to have fun battling or enjoy the sights?

Inaccessible Areas
There are a few tiny corners of in-game locations that exist, but can't be visited without cheating.

Reversal Mountain


Reversal Mountain's donut-type main chamber actually does have an interior section! It's this tiny cavern here - you can even see the stairs in the corner in-game, from one of the offshoots of the main path.

...Seeing it is all you're going to do, though. You can't actually reach it - it doesn't connect to the main path, and the stairs don't go anywhere. It's just...there. There might have been an item in here at one point, judging from the layout and the size of the chamber, but there's nothing of the sort now.

This may well be the single least exciting unused room ever to exist, by the way.

BW Protagonists
Unused dialogue exists for the protagonists of the previous games to use in the Pokémon World Tournament.

Through a specific parameter in a PWT file, you can face the female protagonist, Hilda, as one of your opponents. She doesn't seem to have any Pokemon assigned to her, and the game does not load the unused dialogue strings as default text. Her only programmed line is for when she loses a battle, which is simply a copy of Red's defeated line ("...!").

Oddly, the male protagonist, Hilbert, is absent.

Unused ROM tournaments


There exists a file in all versions of the game that contains data for twelve additional tournaments, all of which are unused. If imported to the Download Tournament menu, it is shown to be data from the 2011 Pokémon World Championships. The ruleset, trainer data, and Pokemon data from the championship was all carried over, so the tournaments can be played as normal Download tournaments. However, the tournament files are slightly unfinished, because the names of the trainers and Pokemon are very weird and out of place.

Each division of the championships (Juniors, Seniors, and Masters) has a tournament file. One is the standard tournament, no modifications at all, while the other is a toned down, easier version. The remaining six files are just duplicates of the first six.

The presence of these tournaments is quite odd, as Pokemon Black 2 and White 2 weren't even out during the 2011 World Championships. These were probably going to be future Download tournaments at one point, or they could have just been used for testing.

Leftover Key Items
Most of the Generation IV key items still exist. A handful, like the Lunar Wing and Magma Stone, are used (fun fact: this is the first time the Magma Stone has been used since it was implemented in Diamond and Pearl!), but the vast majority aren't.

And yes, that includes the other unused key items from Diamond and Pearl like the Seal Bag, Red Chain, and Azure Flute.

Leftover Wi-Fi Mode
There is leftover code and a script command from an extra wifi mode that was removed before the game was released. The command begins the same as all other wifi commands, but essentially does nothing. Due to the amount of code left, there is no way of knowing if this command was for debugging or a late-removed feature. However, it is mixed into the middle of the other such wifi-related commands and as such may mean that it was meant for the player.

Whatever it was, it likely belonged to the woman on the right at the top of the stairs in each of the Pokémon Centers.

Title Screen Music
The titlescreen music from Black and White does also exist in Black 2 and White 2.

Route 10
One of the most liked routes in the region was removed in Pokémon Black 2 and White 2 because of the addition of Humilau City and subsequent areas. However, it seems they weren't entirely removed. The textures, models, and collisions remain, but the scripts, text, wild Pokémon data and building data were lost to time. Through hacking, these three maps can be once again accessible. By default, these maps use the Route 6 theme, although the same header in Black and White used the proper song. It may be possible that Route 10 could have stayed, just with a different song, but was scrapped early on. The game still identifies the location as "Route 10" in the save menu to retain location compatibility with Black and White, however, when entering the route, no eyecatch is present, and when viewing the Town Map, the arrow pointer defaults to the center of the map since the location technically does not exist in the game. When inquiring about your present location to your mother over the Xtransceiver, she says an otherwise unused piece of text (Shown in the section "Unused Text"). When it finishes displaying, the text automatically terminates. nNVAVN2lqqs

Anti-Piracy
These games have the same anti-piracy features as Black and White, with the experience issues. However, they have a new and exciting layer of random freezes, too!

Unobtainable Shiny Pokémon
For the sake of consistency, every Pokémon in every Pokémon game is given a Shiny variant. Most Shiny Pokémon have been obtainable through random chance encounters or event distributions, including most Legendary Pokémon. However, a few Pokémon cannot be obtained in this form without hacking, and as a consequence, normal players would never be able to see their Shiny coloration.


 * Reshiram, Zekrom - These Legendary Pokémon are encountered via fixed in-game battles. However, their probability of being Shiny is locked at 0.


 * Victini - Also encountered in battle, but during a distribution-based event in Black and White. Like Reshiram and Zekrom, Victini's Shiny probability is locked at 0.


 * Keldeo, Meloetta - These Mythical Pokémon were only obtainable through special distributions via Mystery Gift. Pokémon obtained from Mystery Gift cannot be Shiny unless distributed as such, and no distributions of these Pokemon in their Shiny forms were ever planned. The Shiny variant of Genesect, the third Mythical Pokémon of Generation V, was distributed in some Asian countries following the premiere of the 16th Pokémon movie.

Virbank Gym Music
In the Japanese version, Roxie, the gym leader, spells out "Dogars", the Japanese name for Koffing. In western versions, she spells out "Pokémon" instead.

Zoroark Glitch
Part of the post-game involves you following a Zoroark through Victory Road, eventually ending up in N's Castle. In the Japanese version, if you leave the cave without following it, it will appear at its original spot but will not move, preventing entry into N's Castle as well as rendering the player unable to capture Zekrom/Reshiram.

This glitch was fixed for all other regions.

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Humilau Gym Glitch
After facing Marlon and finishing the events of the Frigate, but before Ghetsis, if you talk to Marlon, one of the text boxes that appears will be completely empty. This bug was rectified in international releases. NV9FeVv58OQ