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Apparently, the Decidueye line is listed in the code as "Wild and Playable" and are the only Pokemon line in the code to be listed as such (usually its just either a Pokemon line is listed as wild Pokemon or just playable Pokemon, like how Greedent is listed in the code currently). This might just be them trying to be tricky but I mean, it probably means Decidueye is going to be playable in the future. Which makes sense, its a popular starter.