Just wanting to correct you: Looker was never going to be introduced in that manner in BW23, a Pokemon Smash clip showed that he entered the episode meeting Juniper and Jenny. He'd introduce himself to Iris and Cilan when they all regrouped, yes, but the whole hiker disguise and dramatic reveal that we got here wasn't ever going to be in BW23 at all.
I know that. But the scene where he introduces himself properly and shows off his badge and all that is taken straight from BW23.