Why is code #1 fake? Here's my opinion:

First of all, after reading it, it sounded fake. Who's going to waste their time trying it? I didn't, because you can tell that it's not going to work. How you can press the "A" button twice on Clefairy, while not going into the Pokémon's status menu, is beyond me. And wouldn't you have to press "B" to get back on your main list of Pokémon in your party? Doesn't "B" cancel selections? Wouldn't it cancel out this code?
And how can this Pokémon magically turn into Myuu? No special codes? This will never work. Forget it--it's not worth my time...-_-