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Brock got a cameo...
...At least his green jacket did in that "Mistralton" Tower episode.
Finally, those bags full with money are being used wisely! ~ Made by yours truly ~
The Bond of Aura - 3/31/2013 Update
"Lucario is rewarded by getting to watch "Lucario & The Mystery of Mew." He can't help but compare his situation with the Lucario in the movie..."
4/27/2013: AuraChannelerChris' Youtube Channel: Feature Walkthroughs: Lego City Undercover - MegaMan: Network Transmission
We've had two cameos and a reference to Brock already. Two flashbacks and his clothing. Whether we see him in person is whether we see him have a reunion back at Pallet.
I don't think we're going to see him now. Episode N's opening did not have a character montage of Ash's older friends, so that tells me nobody else will be appearing.