* [[Pokémon HeartGold and SoulSilver: Prima's Official Strategy Guide]] states that Phione is not Legendary (a term used at the time to describe both Legendary and Mythical Pokémon) due to it being able to be obtained by hatching Eggs.
* In [[Pokémon Ranger: Guardian Signs]], all Mythical Pokémon are referred to as "rare," but Phione is not. It is also found normally in the wild.
* Phione [[List of Pokémon that do not appear in any regional Pokédex|is not found in any regional Pokédex]], a trait that is otherwise exclusive to [[Generation IV]] Legendary and Mythical Pokémon.
** Phione is also not needed to obtain the [[diploma]], a trait otherwise exclusive to Mythical Pokémon.