I'm pretty
meh on Reberta so far, she's not that great for the event, and as a single unit she doesn't seem to really shine. Her saving grace is that she has a really awesome sprite.
But having more than one of her may actually make her
insanely strong; as the previous link showed. So by using a friend unit (or having more than one of her), there might be a ton of potential hidden.
I went ahead and got a second Reberta, but I haven't farmed her TMs yet, but I think her breath moves be good to chain as well (Ice Breath with Fryevia's Needle seems to be a good match as well).
a Gif from the reddit link (I think it can be timed better through macro) :