Here is the scene where Serena has a nightmare goes in Ash and Serena's Great Adventure.
(Later that night we see Ash and Serena are sleeping to each other, but then Serena begins to have trouble sleeping as then we went to the dream where Serena is lost in the spooky looking forest)
Serena: Where am I? Hello, is anyone here? Ash?
(Then something is walking towards her from behind as she looks behind to see a mysterious figure standing at her)
Serena: Ash? Is that you?
(Then a pair of red eyes appears staring at her as she back away slowly terrified then the figure runs and Serena runs as well as the figure with red eyes chasing after her)
Serena: Get away from me!
Serena: Ash! Somebody, help me!
(Then scary monsters appears in front of Serena blocking her path)
Serena: Please, don't eat me!
(Then the scary looking Indominus Rex walks to Serena as she backs away slowly terrified and paranoid as the mutant hybrid dinosaur growls at her)
Serena: Ash! Help me!
(Then, a claw reaches down and grabs Serena as the mutant Indominus Rex opens it's mouth)
(And finally, Serena wakes up)
(Serena breaths to calm down as Ash wakes up)
Ash Ketchum: Serena? Are you okay?
(Serena hugs Ash)
Ash Ketchum: What's the matter?
Serena: Oh, Ash! It was horrible!
Ash Ketchum: What, Serena?
Serena: I was in the scary forest all by myself until all of the sudden there were monsters everywhere trying to eat me!
Ash Ketchum: Serena, you were dreaming. It's okay, it's only a nightmare.
(Serena lets go of Ash)
Serena: I'm sorry I hug you tight.
Ash Ketchum: That's okay. Besides I'll get you a dream catcher so that way you won't have nightmares again. (He gets out of bed) I'll be right back.
(Later Ash comes back and brought a dream catcher and puts it on the wall as he goes back to bed with Serena)
Serena: Where did you get that dream catcher?
Ash Ketchum: It was from Skips.
Serena: That was nice of him.
Ash Ketchum: Yeah, he is. Okay time to go back to sleep.
(Ash lets out his hand)
Ash Ketchum: Hold my hand if you want to, so you won't have a nightmare anymore. Big day tomorrow.
Serena: Thank you, Ash. Good night.
(Ash and Serena hold hands to each other and they go back to sleep)