because my yellow pokemon pikachu is marked with that red triangle if I didn't modify it. porque mi pokemon pikachu amarillo esta marcado con ese triangulo rojo si no lo modifique

[Un humano]

[Kaphotics]

That's just the initial fake Pokémon data loaded to the PKM editor. It's not YOUR Pikachu.

Try editing it, you'll see it's just a placeholder template until you actually load a pokemon from party/box.

[Un humano]

Thanks, and also why does my mew come out the same?

[Kaphotics]

Because it probably isn't legitimate.