Pass (depending on health, Aqua Strider may or may not survive Wind Buffet) For guaranteed success, restart fight if Aqua Strider dies, though you should still be able to finish following the steps below
Unfortunately, this is one of those fights that (heavily) depends on RNG. I have tried 10 times so far, and neither of my two striders can make it to the second pump - let alone the wind buffet. The whole strategy falls apart anyway, if Lily uses the Eat the Fly ability. (edited)
Yeah it has to be PP. I tried to figure out how to set breeds but it was still listing all the alts. I tried the HH one but then the Scuttler swaps in instead. 2nd emperor is easy to pick up though and totally worth it.
I was just able to do with HH Emperor, but I think it is imperative that Aqua Strider survives the Wind Buffet. When the Scuttler swaps in, just immediately swap to the Emperor and then continue as above.