This the scene where Demon God Demigra and Black Doom summons a Black Creature Sea Monster and fights G-Merl and the other heroes in G-Merl's Eternal Quest.
(Later the heroes have enter the rocky shore)
G-Merl: There should be a Chaos Emerald somewhere in this rocky shore.
T.K. Takaishi: I think so.
Izzy Izumi: (Looking at his computer) According to this the Chaos Emerald is right here.
Tentomon: But where is it?
Henry Wong: Or where could it be?
Izzy Izumi: It's in the bottom of the ocean.
Rika Nonaka: Oh, great. So we're gonna go hold our breaths as long as we can to get the Chaos Emerald underwater.
Takato Matsuki: We're gonna need mask to get some air while we're underwater.
G-Merl: Then let's go get it.
(Suddenly Demon God Demigra and Black Doom appears)
Black Doom: Hello there.
Tai Kamiya: Who are those guys?
G-Merl: It's Black Doom and Demon God Demigra!
Demon God Demigra: We heard that you and the DigiDestined and their Digimon are helping G-Merl out to look for another Chaos Emerald.
Davis Motomiya: Yeah, but you're not taking the Chaos Emerald from us.
Takuya Kanbara: He's right. So why don't you two creeps just get out of here!
Koji Minamoto: Or we're going to take you two down, one by one!
Black Doom: Then so be it! Let's see if you can deal with that giant sea monster!
(A giant sea serpent monster pops out of the water and roars)
Tai Kamiya: Oh, man!
Kari Kamiya: What is that thing?!
G-Merl: A Black Creature Sea Monster!
Takuya Kanbara: Let's kill it!
Tai Kamiya: Let's go Agumon!
(Agumon warp digi-volve to WarGreymon)
(Seven Digimon jumps into action)
Gabumon: Let's go!
(Gabumon warp digi-volve to MetalGarurumon, Biyomon digi-volve to Birdramon, Palmon digi-volve to Togemon, Gomamon digi-volve to Ikkakumon, Tentomon digi-volve to Kabuterimon, Patamon digi-volve to Angemon and Gatomon digi-volve to Angewomon)
(The heroes fights the black creature sea monster)
WarGreymon: Terra Force!
(He spins like a tornado and hits the sea monster but it hits WarGreymon with it's tail)
Tai Kamiya: WarGreymon!
MetalGarurumon: Metal Wolf Claw!
(He unleash the attack but the sea monster goes back underwater and misses the attack)
Danielle: Where did it go?
Izzy Izumi: Guys! I found the reason where the Chaos Emerald is!
Kabuterimon: Where is it?
Izzy Izumi: The Emerald is in the sea monster's belly!
G-Merl: So that's why.
(Then the black creature sea monster pops out of the water and breaths hot water but G-Merl uses a barrier to protect the heroes)
Angemon: I have no idea, that thing can breath water that is really hot!
G-Merl: Watch out guys. It's water breath is very extremely hot.
Tai Kamiya: Easier said then done.