Pokémon Gold and Silver

Pokémon Gold Version (JP) and Pokémon Silver Version (JP) (formerly known as Pocket Monsters 2: Gold and Silver (JP)) are the second installments of the Pokémon series of RPG video games developed by Game Freak and published by Nintendo for the Game Boy Color. The series featured a new region entitled Johto and introduces a century of new Pokémon. Pokémon Crystal was created as a sequel to the games. A remake of these games was released for the Nintendo DS known as Pokémon HeartGold and SoulSilver. Unlike Pokémon Red and Blue, this game has time and the seven days of the week. You can catch certain Pokémon depending on what time of day it is, and on some days there will be events.

Why it's Nostalgic

 * 1) A whole new region to explore, named Johto, which based on Kansai, Japan.
 * 2) It has the biggest post-game content in any Pokémon game to date (not counting the remakes), as you can explore the Kanto region and obtain all the Gym Badges. Since the game takes place 3 years after Generation I, many elements of Kanto have changed.
 * 3) The game features a hundred new species of Pokémon, a big deal at the time.
 * 4) Improved graphics, including for the first time in the main series, fully colored graphics, both for the Pokémon "sprites" as well as the overworld, making it much more interesting to look at.
 * 5) * In Pokémon Crystal, Pokémon have battle encounter animations, a first in the series. In fact, because there was 251 Pokémon at the time and every one of them had an animation, the game ended up pushing the Game Boy Color to it's limit.
 * 6) Shiny Pokémon are introduced, which are Pokémon with different coloring from the standard, they are extremely rare to find.
 * 7) * There's a Gyarados that's 100% guaranteed to be Shiny found in-game, which informs the player of Shiny Pokémon's existence.
 * 8) A day and night cycle is introduced into the game which influences the Pokémon that can be caught in the games. Also, it determines whether Eevee evolves into Espeon, or Umbreon.
 * 9) Pokémon friendship is now applied to all Pokémon, and is now used to determine the power of the Frustration and Return moves, as well as allowing evolution by friendship. Friendship is gained by taking care of a Pokémon well, and is degraded by letting it faint or feeding it bitter items.
 * 10) Most Pokémon now have genders, which ties into the new ability to breed Pokémon together to get Pokémon eggs. If you put a compatible male and female in the Daycare center, they'll produce an egg that will hatch into a new Pokémon of the mother's species.
 * 11) You can trade Pokémon from Generation I into the Generation II games and vice versa.
 * 12) Lavender Town's music is changed so that it is now more cheerful than before, resolving the whiplash of emotions found in Generation I games.
 * 13) Separate pockets were introduced for the bag to hold a specific type of item.
 * 14) The final battle encounter is fought with Red, the original player character in Generation I.
 * 15) The Crystal Version is the first game in the series that allows you to play as a female character.