It is in volcano island go into geyser plains and you will see it next to the volcano overlook enterance!
From Gamefaqs.com: Pichu can be recruited in Amp Plains, on the ninth and tenth floors.
The ninth term in a series is called the "ninth element" or the "ninth member" of the series.
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Ninth is the correct spelling.
Ninth
Ninth is 'neuvième' in French.
The word for "9th" is spelled out as "ninth".
13 ninth
The Double Ninth was created in 1929.
The Ninth Man was created in 1976.
The Ninth Avatar was created in 2010.
Ninth Street was created in 1999.