There is Mew Mew Power (that's the one in English) which was cut short because of ths weird religious thing---but Tokyo mew mew is basically the exact same thing except in Japanese/Chinese.
Mermaid Melody Pichi Pichi Pitch by Pink Hanamori
In the first season"Mermaid Melody Pichi Pichi Pitch" are 52 episodes and in the second season "Mermaid Melody Pichi Pichi Pitch Pure!" are 39 episodes.
91 episodes from both series together 52 episodes in Mermaid Melody: Pichi Pichi Pitch 39 episodes in Mermaid Melody: Pichi Pichi Pitch Pure
Yes , 'Mermaid Melody Pichi Pichi Pitch' is an animeseries .
There is nothing after season 3 Mermaid Melody Pichi Pichi Pitch Pure.
If you are talking about the manga series Mermaid Melody Pichi Pichi Pitch, then there are 32 chapters divided into 7 tankobon (volumes).
No
Season 1 episode 53 ( last episode of season 1 Mermaid melody pichi pichi pitch, next season is called Mermaid melody Pichi pichi pitch PURE)!
yes
Hippo and Yuuri met in Mermaid Melody Pichi Pichi Pitch episode 25. They meet again in Mermaid Melody Pichi Pichi Pitch Pure episode 18.
Mermaid Melody Pichi Pichi Pitch Pure Episide 25
It was released on April 3, 2004 under the name Mermaid Melody Pichi Pichi Pitch Pure.