Hmmmm, Lugia? It's a legendary, that's pretty scary to face. The "morning sun" part might refer to the warmer, more fiery ho-oh, and it's a flying/psychic type Diving Pokémon, which would explain the references to its intelligence, the ocean and the rising with the wind. The swordsman part might refer to the fighting types it has a particular advantage against, being both flying and psychic type (like gallade, maybe?), and the end could refer to its appearing pretty late in the game. Don't know how the "maturing" part fits in with a non-evolving pokémon, but this is just a guess.