This reminds me, Cilan and his fellow Gym leaders didn't help fight the Seven Sages in B/W, which must mean that they just made him look lame by saying he didn't know, or it wouldn't he was too weak to go and fight, but he'd been training the who game so o___o
I was thinking that there were too many Gym Leaders in comparison to seven of those Sages. It was easier to omit them than try to work out a way to make 11 vs. 7 seem fair. It's quite possible he was too weak, but in-game they mention that they weren't informed. Which means they genuinely didn't know. Of course, if we were to look at it in a more negative way, perhaps the three were purposely not informed.
I however, like to think that they were merely uninformed, and missed out as a convenient plot device.
Just checked a few things on Bulbapedia; so far no airdate for the episode of Dento fishing. There is already sketches of another episode of Emonga vs Snivy which means no episode on Dento yet. -sigh-
Lame as! I wonder if they're just going to flat-out cancel it...