question, how do you do this? do you like train an ai to say random stuff like this?

so how do you make it so the AI generates titles or something like that? (Like what you did for Mettaton's cooking show)

You mean textures? I just do the same thing as dialogue boxes, but just remake the textures myself. Omega Flowey's textures were made based on what the textures were called in the game files and then replaced with Google Images.