Here are the first, second and third generation Pokemon cries in WAV format.
Generation 1-3 Cries
They have been obtained from my Pokemon Program Suite tool's resource files. No credit to me is needed, though would be appreciated.
Waterfall Autotile, Ripped by myself, not entirely perfect. But it does it's job. Has a 1 pixel width error which can be edited out.
Do include credits for the waterfall though (If you like)