Swapped Sun Darter hatchling to Soul of the Aspects, but switched to Yu'la immediately after Deflection, and did Breath, Life Exchange Breath instead, continue with Dark Whelpling as described above, then use Soul Aspect to finish it up.
Persistently successful variation on the above using the first two pets but the Ironbound Proto-Whelp and Tail Sweep and Yu'la's Celestial Blessing. Only one pet dies.
Turn 1 Ethereal
Turn 2 Sunlight
Turn 3: Swap to Yu'la, Broodling of Yu'lon
Turn 4: Life Exchange
Turn 5: Celestial Blessing
Turn 6: Swap to Ironbound Proto-Whelp
Turn 7-8: Tail Sweep until Proto-Whelp dies from Antaen Cannon
Turn 9: Swap back to Yu'la and Breath until dead.
Asking since someone will ask this eventually
Is there any way to change the Dark Whelpling to something else? The Albino Chimaeraling have moveset and the P/P Breed is very similar but with 81 hp less. Which stat is important for the Dark Whelpling?
Hey! I was given this strategy and didn't have a chance to test it myself. It's definitely one of the toughest fights of Argus. The Albino could work indeed, but you'd just have to try it. Or postpone this one and check back later if other people suggested other combinations, although I currently don't see a way around the Sun Darter Hatchling