What were the moves that Groudon, Kyogre and Rayquaza used in the Pokemon Strongest Mega Evolution Act III?

Question

I know that in the episode Groudon used Precipice Blade, Hyper Beam and I also know that Kyogre used Origin Pulse, Sheer cold (I think) and Rayquaza used Dragon Ascent, Hyper Beam and Draco Meteor, but I want to know what this move is at 00:12 in this video because I have no clue. Answer me please ;-;

Comments

I think questions about fan-made videos aren't allowed.

---

The original short is not fanmade, but the linked video is.

---

It looks like Solar Beam, but I could be wrong. :P

Answer 1

We only know how the move looks like, and nothing else. I'm sure it's Solar Beam, no other move Groudon learns looks like that.

Answer 2

https://bulbapedia.bulbagarden.net/wiki/Solar_Beam_(move)

It was Solar Beam. If you scroll down to the anime part of the page, you will see Primal Groudon firing a green energy beam.