I honestly think you can't, why would anyone program that or even have it as a glitch.
There might be some sort of mod that I never heard of...but I have heard about alot of mods.
Chat with our AI personalities
This is not something that cannot be done in any officially licensed Nintendo game.
No. Try porn instead.
No, Ash is never naked.
no she never is seen naked in dbz
It is not legitimately possible to make your character naked in any Pokémon game. The only way to make your character naked is to hack a naked player sprite into your game.