Suicune first appeared in Johto where Ash and Goh came and discovered it while it was being hunted by some Pokémon Hunters who lure Suicune and try to capture it. The hunters have their Pokémon bombard Suicune with Sludge Bombs, with one of them keeping Ash and Goh from approaching as Suicune is tied down with ropes and nets. Desperate to come up with a way to save Suicune, Goh pulls out a Poké Ball and tosses it at the Legendary Pokémon, thus successful catching , much to everyone else's astonishment. The hunters, displeased of having their hard-worked catch being taken away from them, intend to take it back by force. Ash use his Pikachu and Lucario to hold them while he tell Goh to go and and help Suicune, which he agrees. As Goh rushes to the Pokémon Center to heal up Suicune, he ends up tripping and dropping Suicune's Poké Ball. Suicune then emerges from its Poké Ball and glares at Goh, displaying a very clear distrust towards him. Goh tries to convince it to come to a Pokémon Center with him and attempt to recall it, but it simply freezes its Poké Ball with Ice Beam and climbs up to a nearby tree to rest. Goh climbs up after it and finds several forest Pokémon standing before Suicune in an attempt to protect it, as it had cleaned the lake up for them. Goh tells them he's not one of the hunters and want help to Suicune. Goh helped it recover with Berries and a Potion thanks with Pokémon and nurse it back to its strength. However, when the Pokémon Hunters return to capture Suicune, Goh tries to defend Suicune with his own Pokémon and caught a Drowzee in order to fight the hunters' Poison Pokémon more effectively. Although Goh manages to hold his own for a while, the hunter boss then sends out his Houndoom, which easily defeats Drowzee with a single Crunch. The hunters seize Suicune in a net and pull it down from the tree, beating it up as Goh begs for them to stop. Just then, Ash and his Pokémon returns to help, and the two engage the hunters together. Although Cinderace ends up getting poisoned as well, Goh refuses to give up. Just as the boss tries to finish Goh and Cindeace off with Houndoom, Suicune, having observed Goh's determination, breaks free from the net to save Goh and agrees to battle by his side. Under Goh's command, Suicune able to take of the hunters' Pokémon are defeated, and freezes the hunters with Ice Beam. After the hunters were defeated and arrested, Goh decided to release Suicune, but it chose to remain his Pokémon, after seeing how it care for when it injure and protect from hunters. However, when got back to Cerise Laboratory, instead of staying at the Cerise Park, it returned to roaming around the world while still remaining at the Park in spirit.
- Unlike Eternatus, Suicune is the first of Goh's Legendary Pokémon that stays under his ownership, despite not being directly close to him like most of his Pokémon at the Cerise Laboratory.
At the Cerise Laboratory