Here is the Post-Credits Scene in Team Robot in Pokemon: Diancie & The Cocoon of Destruction.
(After the End Credits, Primus and the Other Villains Appears in the Allearth Forest)
Primus: Hello, Is anyone there, Hello?!
(But no one can hear them)
Primus: (sighs) I can't believe those fools lost to them, Hello?!
Natalia: Those Lousy Americans and their friends is getting on my nerves!
Myotismon: Somebody explain something!
(They can't hear them)
Primus: (Sighs) Fine, if it's done right, we'll just do it ourselves.
Hans: Look over there.
Ice King: Uh, over there.
(As they Continue walking, they sees the cliff)
Primus: Hello, Fine. I'll deal with them ourselves.
Natalia: Let's go.
(They walked to the waterfall and see Argus' Airship still crashed into the lake)
Hans: What is that?
Primus: A crashed Airship, wonder how did that happened?
Natalia: Mal, You foiled again this time, But I'm getting Started.
Myotismon: Well, what did we know?
Vexus: Now we gotta plan.
Shredder: Go ahead Scan.
(Primus scans then completes reveal the data of Legendary Pokémon)
Natalia: Excellent timing.
Vexus: What is that thing?
Shredder: That's Hoopa.
Natalia: (She hears her two way radio) Yes, Tirek. We lost them. Yes Primus has scan a Legendary Pokémon.
(We cut the scene to Tirek Hears Natalia with his two way radio alongside The Dark Masters)
Tirek: Yes, indeed and I have the Dark Masters right here.
Piedmon: (Silhouette) Hello, Natalia is going well.
MetalSeadramon: (Silhouette) Yeah, we think so.
Puppetmon: (Silhouette) The Russian spies are doing really well.
Machinedramon: (Silhouette) About Hoopa.
Tirek: Head to the desert city and find that prison bottle.
(We cut the scene to Natalia and the other villains)
Hans: Is there any ideas?
Primus: Yes there is one way-
Natalia: Goodbye. (She turns off her radio)
Primus: Natalia. What does Tirek want?
Natalia: He says he's going to bring more villains to help us out, capture the Prison Bottle to possesse Hoopa and destroy Team Robot, Primus.
Primus: Perfect, now all we gotta do is go to désert city and find that prison bottle and destroy Emerl and his Team Robot once and for all.
Myotismon: Then let's go.
(As They Leave)