The story is exactly the same. The only difference is some Pokemon can only be caught in a specific version. Also, with a few other Pokemon, where and how often they appear varies by the version. There's maybe a total of 15 Pokemon exclusive to each specific version including the one on the game box cover. So if you have the urge to catch them all, you'll need to trade with someone with the opposite version of what you have.
My friend didn't want diamond cuz he thought the guy on the front looked like a dog. I don't get it. He has a dog, so its not cuz of that. I got diamond though. And in every new pokemon game, they always come out with two, for the same reasons Davis said.
Ever since the Pokemon franchise released the Game Boy Color games, they have come out in pairs. This is primarily for two reasons: to encourage you to buy both, and to make the otherwise solitary gaming experience actually encourage the player to go out and find people with similar interests, who have the other version of the game.
During play and for all logistical reasons, there is no difference between the two games. Each have the same story line, the same characters, the same goals. However, though there is an interesting, well-woven story to follow, as with all games, the Pokemon plot can be completed after you beat the game. Here is where the genius that has allowed Pokemon to last so long comes into play.
While the story itself can be completed, there is another important goal to be reached: capturing and raising all of the different types of pokemon in the world. Once you have possessed a pokemon, your 'pokedex,' or 'pokemon index' records its information, so even if it evolves or is traded, your pokedex proves that you had it. Because of this, the trading feature is one of the most valuable and popular aspects of the games.
When you find another person with a Pokemon game, you can trade pokemon with them. Not only will the pokemon you recieve grow faster, but this is a simple way to 'catch' all of the pokemon. Especially because, between each Pokemon game set (in this case Diamond and Pearl), there will always be around ten pokemon which one game version can find and catch in the wild, but the other version cannot.
Essentially, the two versions encourage more to be bought, but they also help the generation of children who are fully capable of entertaining themselves via technology become more extrovertive and social.
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Although, they ALWAYS come out with a third, usually for a reason adding to the story line. (Example: Ruby and Sapphire came out first. Emerald followed to 1. Get all pokemon in one version as well as both legendarys. and 2. because of the addition of the battle frontier.)
The main difference is the legendary Pokemon which are Palkia and Dialga. That's the main difference; not that big of difference. You can trade for the other anyway through WiFi, the internet, etc. Also keep in mind that some common Pokemon can't be caught in some games like how Silver/Gold was.