The Pokmon TCG Pocket has responded to recent allegations of plagiarism by removing Ho-Oh and Lugia cards from the Wisdom of Sea and Sky expansion
However, an even greater list of creature types were featured that were later changed via errata, including Cobra, Being, and Effigy, which were changed to Snake, Human, and Elemental, respectively
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Theyre pretty similar to Dragon type attacks, in that they require a combination of different energy types to use (check out our guide to Pokemon energy types for lots more detail on those!)