as far as I know otters also rape creatures in the animal kingdom and no otter pokemon is based on that. This whole elephant seals fight in the wild is a little silly to go off of, I agree with Aromantic. If it was based on their fighting in the wild, then it would have been a physical fighter. It wouldn't be a special fighter because they don't blow bubbles at each other in nature, they use close combat, as someone specified, so they wouldn't half base it off of that, they'd most likely go all the way. The fact they're already leaning towards circus and entertaining goes to show they're not really going for the violent nature, but the entertaining aspect of the creature. I get why people want the water fighting type, but just because of the animal being violent when it comes to mating and territory and wanting to have sex, like A LOT of animals in the animal kingdom, this pokemon doesn't have anymore chances of being related to it's dark natures as much as any other pokemon based off of animals.
Beetles also fight in the wild and are pretty much a sport people actually bet money on, fighting type on them and fighting type moves on all Beetles up to now.
Saying a seal wich is a good example of a fighting animal won't represent that is like saying a a horse or deer won't use its hooves for self defense.
Pokemon has taking a lot of liberties before, Seals creating spheres out of an elongated nose such as that one of a hooded seal.
Aura sphere, focus blast, water pulse, hyper voice and other moves could be directly channeled through an appendage and still maintain the theme.
Look at Rhyperior, Blastoise, Clawitzer, Magmortar and Mega Heracross they have cannons implemented in their designs, a proboscis is pretty much installed on 4 seal species and they already have an odd nose and a sound move on popplio. Design, seeing him develop on that trait wouldn't break my suspension of disbelief at all. Heck Vikavolt has a railgun jaw.
Also the circus and fairy themes people are seeing are nothing but patterns people want to see and got horribly popular tank to poketubers augmenting them to a point people saw them as real. The clown theme can be seen a bit on popplio, but the collective wish of over frills aren't seen properly outside of some folks imaginarium.