How do i change the text in pokemon games?

I saw a video on Youtube and it was a Pokemon game. But who ever put it on there changed all the text in it and made it really funny. There was something about a text editor. I was wondering if someone could tell me how to hack the game and change the text and all that. Thanks.How do i change the text in pokemon games?
i got no idea,but you can try creating a account in youtube and ask those peoples how to hack.

cream song