What episodes were they? I remember searching for the older Pokemon episodes and couldn't find a whole lot of them... Especially hard to find in Japanese.
Well... I don't download my anime, so I always end up searching for stuff, and a number of sites I go to are: Veoh.com, Pisoga.com, Google Video, Myspace.com, Anime6.org, Anime-media.com, and Cruncyroll.com. Google video shows videos for Veoh, Youtube, Myspace and some others. So I'd search that first...
Err... Hope this helps. o.o