Ash has a talk with Mewtwo

The gang camped out in the middle of nowhere. They had just left Alamos Town. Because of an incident that took place there, Dawn couldn't stop thinking about their visit.
"I must ask?" She asked the boys. "Was that incident with Dialga and Palkia like the incidents you told me about."
"Yes, but normally it's a bad guy behind the incidents." Brock said.
"Yeah but there was no bad guy this time at fault in Alamos Town." Ash said.
"Except Baron Alberto." Tomo joked.
The others laughed.
"I have to say." Brock said. "We did get Dialga and Palkia to stop fighting, but we never found out why they were fighting with each other."
"You're right Brock." Ash nodded. "But we'll probably find out why the next time we see them. I have a feeling that somehow we may end up meeting Dialga and Palkia again."
Dawn hoped if they did it wouldn't have anything to with another raging battle.
Because of what happened in Alamos Town, Ash decided to have a conversation with Mewtwo. He walked away from the others and took out his Master Ball.
'Mewtwo, it's Ash.' He said.
Mewtwo was flying over a forest when he heard Ash's telepathic message.
'Ash.' Mewtwo said. 'I've heard from wild Pokemon that a disturbance happened in a place called Alamos Town. What happened?'
Ash informed Mewtwo about the fight between Dialga and Palkia.
'They have stopped fighting now because of a song called Oracion, which has the ability to calm down raging Pokemon. But I have the feeling we'll meet them again.' 
'Did someone do anything to them to make them fight each other?' Mewtwo asked.
He remembered the confrontation between Groudon and Kyogre.
'No there was no bad guy controlling them.' Ash said. 'And the others and I never found out what caused them to fight each other.'
Mewtwo frowned.
'Mewtwo I fear that Brock, Tomo, Dawn and I will go through rough times here in the Sinnoh Region.' Mewtwo believed that as well and he promised to immediately tell Ash if he felt any disturbance with Dialga and Palkia again.
After speaking to Mewtwo, Ash rejoined the others. So there were three things to deal with during the journey in Sinnoh. Deal with Hunter J, find out about Team Rocket and find out the deal between Dialga and Palkia was all about.