Well, I saw someone call them that before I started calling them that but they do remind me of Musketeers... and their hats and Pokedex entries hint at it too. And Kerudio really looks like a Musketeer wannabe. AND their ability, Justice Heart makes me think of Musketeers fighting for justice.
Interesting. I can definitely see all that working, and I do like the concept of having "Musketeer" Pokemon haha. Also their Dex placements sorta work, as the trio were together from the start, but the fourth Musketeer didn't showed up till later (if I remember the story right?)