Here's how Manaphy's goodbye goes in Little Bear's Adventures of Pokémon Ranger and the Temple of the Sea.
[We then see something hoping out of the water, and then out comes the surface is Manaphy]
Rainbow Dash: Look there!
Manaphy: Mana! Mana!
May: Manaphy?! [she climbs down the ladder]
[Soon Manaphy jumps out of the water and into May's arms]
Manaphy: Love you.
May: I'm so proud of you, and all that you've done.
May: You won't forgive me, will you?
Manaphy: Love you, May!
May: [gasps] Goodbye, love you.
Manaphy: Love you, Mama. Love you, May.
[May looks at Manaphy tearfully happy at Manaphy]
Little Bear: Manaphy, wait! We just wanna tell you that you we're a great friend. And we appreciated you.
Manaphy: Goodbye, Little Bear. And your friends, too.
Cat: Now, I know I got a heart for Water-type Pokémon like you, Manaphy. Because I can hear it breaking.
Manaphy: Phy! [jumps out of May's arms] Mana, Mana! [lands in the water and splashed away]
Ash: I'm gonna miss Manaphy.
Duck: Me too.
Hen: I think he's the best Legendary Pokémon we've met by far.
Max: May, are you alright?
May: No, I'm not all right. But I will be.
[Soon it goes out into the ocean where Manaphy returns to Samiya and it fades out to black. And ends with "My Heart Will Go On"]