Here's why:
* Game Compatibility: Pokémon games use specific codes and data structures to identify legitimate Pokémon and allow trading. Fake games often mimic the appearance but lack the correct code, meaning your game won't recognize Pokémon from a fake version.
* Security Measures: Nintendo has implemented security measures to prevent trading from illegitimate sources. Your real game likely won't accept Pokémon from a game it doesn't recognize as genuine.
* Account Bans: Attempting to trade from a fake game could potentially get your account banned. Nintendo takes cheating and the use of unauthorized software seriously.
Trading Pokémon should only be done through legitimate means. This means using officially released games and trading through Nintendo's online services.
Important Note: Beware of websites or individuals offering to trade Pokémon from "cloned" or "hacked" games. This is often a scam to steal your real Pokémon or access your account information.