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One revelation people are sleeping on from the art leaks is that it seems the animation department don't know that Slowking evolves from Slowpoke and not Slowbro. If there is a split evo (like poliwrath/toed or the eeveelutions) they don't use another arrow, they have the split evos all next to each other. With Slowpoke they have Slowpoke>Slowbro>Slowking on all three of them, and since this is word of god internal references it means that this error that people get revealed as noobs or secondaries for has been unnoticed in the art refs for years.