Here is the scene where Primus gets resurrected in G-Merl's Eternal Quest.
(We then cut to see a dead body of Primus who was killed by Zekrom back in the previous movie "War of the Apocalypse")
Dr. Eggman: There he is, Primus. It's a shame that he was killed by Zekrom. But no matter, I'll take him to my lab and revive him.
(Cut to Eggman's lab where he is reviving Primus)
Dr. Eggman: Now it's time that you awake Primus!
(Primus is then revived)
Primus: Yes! I'm back!
(Then Primus flew closer to the ground, and landed)
Primus: Fellas, I'm home.
Orbot: Primus, We were... so relieved to hear of your resurrection.
Primus: You left me to die on that pathetic insect planet.
Cubot: Only to help spawn our... new army. Master Xehanort decrees it! After all, in your absence, someone had to take command.
Primus: So disappointing.
Orbot: Hatchlings! Hatchlings! Careful, fragile!
Primus: Even in death, there is no command but mine.
Orbot: No, no, no-
Hatching: [squeaks, death throes]
(Cut to Primus talks to Demon God Demigra, Black Doom, Galvatron and Master Xehanort)
Primus: My friends, I have failed you on earth. The heroes have saved many Legendary Pokémon and without them, we will never rule the world.