I maintain that Evil Togepi is the best filler episode, and makes a decent case for the best episode ever period. I mean... you gotta love an episode in a children's cartoon that frequently breaks the fourth wall by openly making fun of how stupid the main characters are. I mean didn't the gang fall for the same trick like three times before one of them finally realized the Togepi was up to no good??? XFD dumb children.
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