the movies were made to be watched as a bonus to the anime, you dont half to watch the anime to watch the movies, but you half to watch the first movie to watch the rest
try youtube, or google
Youtube season 2 begins with episode 53
i found several places on the enternet try typeing in 'keroro gunso subbed' into google and you will find several websights.
Episode 83
last
titi.com
After the last episode, episode 70.
There is no right episode. The movies does not follow the story line.
ya u can watch it here: http://www.narutowire.com/watch/607c58dd816c7e9fa29e/Naruto-Movie-Episode-5
Watch episode 51 and then the movie: The Conqueror of Shambala
You can watch the movies whenever you like, the does not follow the series timeline and it not mentioned in the story
www.popeater.com/.../friends-movie-the-next-big-reunion