Here's why:
* No duplication glitches: The game doesn't have the same glitches and exploits that allowed cloning in previous generations.
* Game Freak's anti-cloning measures: The developers have implemented measures to prevent cloning, making it very difficult to find ways to exploit the game.
However, there are alternative ways to get multiple copies of a Pokemon:
* Breeding: You can breed Pokemon to get eggs that hatch into new Pokemon with similar stats and moves.
* Trading: You can trade Pokemon with friends or online using the Wireless Adapter or Nintendo Wi-Fi Connection.
* Using an external tool: There are external tools that can potentially manipulate the game's save data, but these are considered cheating and can risk corrupting your save file.
It's important to remember that using external tools to manipulate game data can have negative consequences and may be considered cheating in online communities.