There are a lot of Pokemon movies, and you can watch them all on youtube, but here are some links. Not all of them are official, but it should be pretty much the same thing anyways. If a link isn't satisfactory I can change it with a better one, I havent tested them all.
First Series! Pokemon: The First Movie: http://www.youtube.com/watch?v=iJjaJjJLfXE Pokemon: The Movie 2000: http://www.youtube.com/watch?v=c5sVfMvQmMg Pokemon 3: The Movie: http://www.youtube.com/watch?v=pfJdyo4MFac Pokemon 4Ever: http://www.youtube.com/watch?v=DvQ7dEwjqWk Pokemon Heroes: http://www.youtube.com/watch?v=R1vtAAhkJvs
Now onto the second! Jirachi Wish Maker: http://www.youtube.com/watch?v=b7qaeFS5JPw Destiny Deoxys: http://www.youtube.com/watch?v=QDZZnPwMPMk Lucario And The Mystery Of Mew: http://www.youtube.com/watch?v=A7TIO3OzKb4 Pokemon Ranger And The Temple Of Sea: http://www.youtube.com/watch?v=EeS22Scr4Pg
The third! The Rise Of Darkrai: http://www.youtube.com/watch?v=pT9cVpoGfKs Giratina And The Sky Warrior: http://www.youtube.com/watch?v=c1RnodW3P78 Arceus And The Jewel Of Life: http://www.youtube.com/watch?v=9FgCWTTs-yk Zoroark: Master Of Illusions: http://www.youtube.com/watch?v=hCVPYzxIF2g
The fourth, nearing the end! White- Victini And Zekrom: http://www.youtube.com/watch?v=sgpqZq8KG8U Black- Victini And Reshiram: ??? Kyruem Vs. The Sword Of Justice: http://www.youtube.com/watch?v=Zmd_uEHxO0Q Genesect And The Legend Awakened: http://www.youtube.com/watch?v=Tn5BvytJooA
Finally, the fifth series! Diancie And The Cocoon Of Destruction: http://www.youtube.com/watch?v=v7SS33mFv5M Hoopa: The Archdjinni Of The Rings: http://www.youtube.com/watch?v=388DdlvVcsQ
Some of the links might not be the best, but googling (name of movie) trailer will usually get you some good results. I havent tested them out myself so I'm not sure if all of them will work. Hope I helped!
Pokemon.com. All you have to do is click on movies and it shows you a page with the movies just chick on the one you want then click play.
