>>36180083Eelektross might be based on electric eels, but these Pokemon do not live underwater in the games. They always live in caves. Plus Eelektross' niche (no weakness) will be mitigated if it is given a secondary typing.
>>36180404Malamar is an evil squid capable of hypnotizing and controlling people. Dark/Psychic. Inkay are never found in the water anyway. (Both Pokemon have Japanese names that include ma, the Japanese word for demon.)
>>36180409Lugia isn't Water-type because it never originated from the sea. Lugia used to live in the skies, but it had so much destructive power that it destroyed forests and buildings. To minimize its destructive capabilities, Lugia decided to live underwater, but this proved to be futile as Lugia could still conjure storms with its psychic powers.
>>36180420It was a Water-type as a Skrelp, but it became more draconian after it evolved and Pokemon can only have two types.
>>36180438Dhelmise is haunted seaweed that collected rocky material and metal underwater to form its massive anchor. Grass/Ghost.