Even though Eelektross is a Electric Fish Pokémon, it is not a Water-type.
Eelektross is the third Pokémon to have no weakness to any type due to its Levitate ability.
It is the first Pokémon to have no weakness who is not of the Dark/Ghost-type combination.
This is the first Pokémon that has no weakness to have evolutionary forms.
This is also the first Pokémon to have no weakness that is a single type.
Eelektross resembles a lamprey.
Despite the fact that Eelektross is the Electric Fish Pokémon, it hops up and down on feet like appendages, instead of floating as if it is swimming like other fish Pokémon.
In the Pokémon Black & White official Guidebook Eelektross is Ghetsis's only Pokémon whose "move to watch out for" isn't a S.T.A.B. attack. It's the Dark type move Crunch, and Eelektross is a pure Electric type.
Despite having "no weaknesses" due to its Levitate ability, Eelektross can still be hit by Ground-type moves if the Pokémon using the move has the ability Mold Breaker or the Pokémon has used the move Gravity in the previous turn, whereas Spiritomb and Sableye cannot be hit with super effective damage at all; Fighting-type moves with Foresight deals only normal damage