I don't know if this is the case for the Gen 6/7 IV Calculators, but for this one, Plant Cloak Wormadam has a composite sprite with all three forms in it while Sandy Cloak Wormadam has "413s" instead of a sprite and Trash Cloak Wormadam has "413t" instead of a sprite.
Old king coal set on coalossals pokemon of the week entry is listed as using a calm nature. As this lowers attack and the set uses physical attacks, I think it should be a careful nature for the special defence boost.
The current Pokemon of the week (Golurk) talks about using Steam Engine, which isn't a thing Golurk gets and looks like it was just straight up copied from Coalossal's entry and only the Pokemon name was changed.
"These Pokémon are obtained by purchasing the License to use them in the shop, or earning their license as a reward, but all can be played in the Practice Area regardless of if you have obtained them yet. You will also get several free Unite Licenses which rotate each week, butthese cannot be used in Ranked Battles."
Minor spelling error, just missed the space there in the spot I put in bold.
On the home page, under the "Pokemon of the Week" section for 01-08-2021, the entry is attributed to that of a "Kanto Pokémon". But it goes on to say it--Umbreon--was introduced in the second generation. Would it perhaps be more appropriate if one were to speak of it in terms of being "discovered in Johto"?