OnceUponATime
Wicked
Over on the PokeGolf thread, Defender said the following:
So it's safe to say that Iron Tail is not being replaced with Splishy Splash here. Which still begs the question of how exactly Ash will win with Quick Attack and Iron Tail without feeling forced...
Pokenchi showed footage from the episode, and we saw that Satoshi's partner is Pikachu.
They also roughly explained the rules of Pokegolf - basically, the Pokemon partner is allowed to use their moves to affect the ball while it's still in the air. We saw Pikachu jumping up and using Iron Tail to give the ball a second hit as it flew by.
So it's safe to say that Iron Tail is not being replaced with Splishy Splash here. Which still begs the question of how exactly Ash will win with Quick Attack and Iron Tail without feeling forced...