Usually wins around round 41. Only fails if Plumainfame gets crit and top-ended by Crush.
Both breeds of Val'kyr nonata work, but H/H basically can't fail to crits while B/B sometimes can.
I highly recommend just using the script. The steps might be a little hard to follow, so I'll explain in more detail here:
It's important to note that the Baba muy pegajosa debuff must have 2 turns left to stop Desaparecer from swapping. If it only has 1 turn left, Frill will swap out anyways. His Desaparecer casts aren't 100% consistent, so whenever its CD is 1 round or less, you can only cast Baba muy pegajosa or you risk getting juked and Frill swapping out.
You continue to tank with Zoom until the Trampa de magma is gone and Apalear has 5 turns of CD left (so you have time to combo with your Val'kyr nonata and Plumainfame). Sometimes you'll only have to keep Zoom in for the first round and other times you'll have to tank a full Apalear cycle.