It appears another "gigaleak" has gone down, involving Nintendo. According to sources online, it appears that Game Freak has been hacked, resulting in internal data from the company being leaked to the public. Those involved in the hacking community or those within general Pokemon related groups...
Terabytes of the same game, just in different colors.
Sort of. The same game, over and over, each time in a different colour, each time with a higher pixel density, each time a little bit worse.
Which is exactly why I stopped playing after Gen 2, which was the peak of the series IMO. If you want to see everything the series has to offer, just play Gold/Silver (or their remakes on the DS). No reason to waste time and money on any other Pokémon game.
Gen 4 was peak IMO, both the new Pokemon were excellent as well as the best remakes ever made. Gen 4 has Platinum and HeartGold SoulSilver which are the best games in the series.
Pokemon Black/White 1 & 2 are as close to that as you want. Great story, amazing songs that i still hum to this day, and the designs are as solid as Gen 1 and 2.