Marrave, the Water/Ghost skeleton fish Pokémon.
Its skeletal body allows it to glide silently through the waters of the lake, giving it the ability to sneak up on unsuspecting prey. Those who catch a glimpse of Marrave, whether in its normal or shiny form, are said to be blessed with good luck. However, those who are lucky enough to see the shiny form are believed to receive even greater blessings. Marrave's shiny form has a red head and black body, making it a rare sight to behold in the depths of the lake.