Was there an error in the anime with Arceus?

Question

In Arceus and The Jewel of Life, we see the fight between Arceus vs Giratina, Palkia, and Dialga. Arceus was missing the types of Water, Electric, Ground, Dragon, and Grass. So why did Palkia, Dialga, and Giratina's Dragon moves not work on Arceus?

Comments

Maybe this was implied about the new Fairy typing, just like what they did with Sylveon in the eeveelutions special

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Maybe. But probably just an anime fail like 50 other times. TBH, the anime kinda sucks.

Answer 1

I wouldn't call it an error, either the moves you thought wre dragon moves weren't or he wasnt immune but he became a type that resists dragon like steel; and arceus, being arceus, took almost no damage.