Funnily, if you use Assist in Pokemon Black, White, Black 2, or White 2, and an Egg is in the party, you could happen to use one of the moves the Pokemon in the Egg would know upon hatching, a factor not present in other Pokemon games.
In the internal coding for Pokemon Black and White Versions 2, there is unused text for the Pokemon World Tournament for the characters Hilbert and Hilda, the main playable characters in Pokemon Black and White, of the original Pokemon Black and White. Why these two characters went unused is unknown.
Pokemon Black/White Versions 2 were the expansion versions to Pokemon Black/White, and were also their sequels. This marks the first time that an expansion version actually had two versions of its own.
The three Gym trainers in Nimbasa's Gym are all named after famous scientists, two of which having discoveries related to electricity: Nikola (from Nikola Tesla), Fleming and Ampère.
The reference is present in the Japanese version as well, although Fleming becomes Fremy, taking the name from a different scientist.
In this game, due to how the formula for Ball shakes when catching wild Pokémon works out, Pokémon will never break out of a Poké Ball in the second shake of the Ball, but only break out when there are no shakes, upon the first shake or upon the third shake.
Girl Killed By Darkrai: An everlasting dark dream... An endless dream of darkness... Dad, Mom, Abra... Where are you?
In the dark dream... I heard my dad's voice... "Forget about the Lunar Wing... Please stay here with me..."
Oh, the Lunar Wing... I can't take it now... But it'll be OK. Please take the Wing to the Pokemon... I was waiting on the bridge so I could return it myself...
Connection to Other Media
There is a lady in Humilau City you can speak to; during the conversation, she says "This dress is comfy and easy to wear..." This is a reference to the Kanto-region Pokemon games in which Youngster Ben says "Hi! I like shorts! They're comfy and easy to wear!", a statement that, while simple, has grown to unusual popularity in the Pokemon fandom and in memes.
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