recently i was browsing serebii at random, and i found out that ever since gen 5, lucario has had heal pulse as a level up move (except for in legends arceus), and i couldn't help but imagine nia wanting to learn it after she evolves. perfect for seeker duties, both in terms of "helpful for injured clients" and "my partner is very danger-prone"! lucario can also learn life dew starting with swsh, which has the added benefit of "actually, both of us are danger-prone and this move can heal both of our asses".
Oh, I forgot about lucario learning heal pulse! That is right up Nia's alley for sure. :D And definitely helpful with these two danger-prone disasters, hahaha!!!