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It is, in fact, from an actual episode.
This is funny ****. But it's still ****. Listen to anything you record yourself a bunch of times backwards if you're a musician and you're bound to find something subliminal.
Yeah, it's definitely intentional. If it weren't, it wouldn't be so clear - if you listen to, say, the section of Stairway to Heaven that supposedly talks about Satan, the "words" are unclear and can be interpreted differently. But I've seen several videos of the backmasked section from Pokemon, and it's always the same words.