I’ll be honest one of my favorite headcanons is that the pokedex is not scientifically accurate whatsoever but rather the result of sending ten year olds out into the world to gather your research for you
this… this makes a lot of sense.
Wait, wait… maybe, then, the Alolan Pokédex Rotomdex is written by the Rotoms themselves. Since Pokémon, no matter the species, can apparently understand each other despite 90% of their vocalizations either being some variation of their name or just plain animal noises, it’s safe to assume the Rotoms have first- or second-hand knowledge of what’s actually going on.
So, the reason the Alolan ‘dex info is so “uncharacteristically” dark/blunt is because, while in other regions, it’s everything filtered through the yet unburdened view of pre-teens (and the professors that enable employ them), in Alola it’s just your Rotom going, “Oh, that guy? Hoo boy, wait’ll you hear this one.”
“see this dude? no one has ever seen it take a shit”