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.
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-2 to the ninth power = -512
Ninth Street was created in 1999.
The Ninth Man was created in 1976.
The Double Ninth was created in 1929.
The Ninth Avatar was created in 2010.