If I had to guess, I think every pokemon who bonded with Ash in all these years of the show and he ends up not catching it was potentially for a capture the staff just decided not to do
For example, hippopotas and spoink. Ash met them more than once and he never got them.
The list of bonded pokemon is quite long, tho.
Would that include cases like Lara’s Rapidash?
Though tbf it’s not like JN Gengar and Lucario are the same ones he met before.
I wouldn’t count failed capture attempts since you never know if we’re not meant to take those seriously or if they’re actual teases to what could have been.
Not sure if I’d count the time he worked with that Meowth, Arbok, and Weezing in that one OS episode. Especially when James got Pikachu, Ivysaur, and Charizard. It was clearly a deliberate team reversal situation.
I just want something official for the ambiguous cases.