If there's water near by that you can swim in, try to bring the unusual hilichurl there by using character's like Rosaria (I heard Jean works too but I'm not sure)
It'll save you a battle without taking that much damage. (Yes, it will say you completed the challenge)

you dont need to adjust your time before going there, you can just stand in the zone and adjust your time. it will appear there regardless

lol

berries also work for "gusha unu boya"

Starconch also works for the "blue hard thing", for those who don't wanna waste materials that are actually useful

I gave a tomato instead of flaming flower stamen and it worked. It seems any red plant will do. Starsilver instead of magic crystal chunk also worked

You can also give a normal crystal chunk on day 4. For the peeps who arents ar 30 yet.

I wanted more to do with the Unusual Hilichurl! looking forward to this event!