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I remember this being talked about back when Super was first released, but I want to try clearing it up. A lot of people think Blacky (Umbreon) and Efie (Espeon) are siblings, but nowhere in the game do they ever refer to each other as brother or sister. They refer to each other by their names in all instances.
The confusion probably comes up because Kurumayu (Swadloon) refers to Efie as onee-chan, which could also be used to refer to older girls. It's not just restricted to siblings.
