Hippo and Yuuri met in Mermaid Melody Pichi Pichi Pitch episode 25. They meet again in Mermaid Melody Pichi Pichi Pitch Pure episode 18.
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Probably, when ash leaves primape in the episode "The Punchy Pokemon" The narrator says maybe they'll meet up again someday.
episode 19
Episode 117
Actually, he does meet naruto in episode 12 and they battled in episode 14-15 or somewhere near that.
The first and so far only fight between Naruto and Sasuke was in episodes 52 and 53. There is no information on the next time they will even meet again let alone fight since the manga hasn't been written to the point where they do meet again.