Mysterious Entities

This "strange man" appears at route 16 at the very back of the route he is like the ghost guys (like the one in Seafoam cave who says a bunch of Jumbled letters) except this one will initiate a battle upon talking to him when the battle starts instead of the regular battle theme it will be the lavender town theme his first pokemon will be shiny kyogre which (from my knowledge so far) has the moves origin pulse,blizzard and hydro pump and thats what i know so far (he also has a total of 6 pokemon)