This is the scene where Primus attacks the heroes as his revenge in G-Merl's Eternal Quest.
(Later everyone are walking)
Ash Ketchum: What is it, Pikachu?
Emerl: Look out!
(A missile came out of nowhere and all the heroes dodge every missiles)
Sonic: What was that?
(Then we see Primus appears who fire missiles)
Primus: I'm back!
Primus: (Laughing) That's right. I'm back for revenge!
Emerl: Primus! I thought you were dead!
Primus: I was, but Dr. Eggman revive me. Now it's payback time!
(Emerl and Primus fight)