Sorry not sorry for my smugness
Exactly. Let’s imagine we’re Cynthia and we’re preparing for this battle by rewatching Ash’s old PWC battles.Is it a waste? If I had to guess, the purpose of relying on Togekiss isn't to beat Lucario; Togekiss just needs to wear down Lucario enough for Garchomp to finish the job. Togekiss is in a good position to tank Aura Sphere--if we're going off of game type matchups--and just needs to hang on long enough to get a good Max Move or two in. Realistically, Cynthia expecting that to be enough for Garchomp to finish the job seems reasonable.
Lucario defeated Machamp and Duraludon because he was at full health when fighting them. Thus, she probably wants to weaken him before finishing him of with Garchomp.
On the flip side, she most likely isn’t too concerned with Sirfetch’d and Dracovish since they didn’t have the best track record.