Tourist Trapped (Season 1, Episode 1) Credits Code

This was the first episode of Gravity Falls. You probably know what the credits codes are by now if you've read my blog before, so...let's get started! Okay, first, the code letters are, "ZHOFRPH WR JUDYLWB IDOOV". If decoded with method #1 (Caesar method or Three Letters Back rule), it says, "WELCOME TO GRAVITY FALLS" because this episode was the first episode.
Code: WELCOME TO GRAVITY FALLS
Method #1