Hmm. It does seem a bit opaque, but I'm going to start by guessing inkay.
The first two lines make me think dark type, which inkay is, and the following part mentions the ocean, which makes sense as well, inkay's being marine. The line after that suggests its unevolved, so I rule out malamar. The part about intelligence makes me think psychic type, which inkay also is, and the part with the swordsman might be referring to how despite inkay is a psychic type, it still has an advantage against the ghost-type honedge (a sword pokémon) due to its also being dark type. Not so sure about the last two lines though, but this is mostly a shot in the dark (which is the type of this pokémon, is that right?).