WOOTZ FALCON PIKNUTS!!!
Nice video (glad you won :D). A few suggestions:
Maybe get a little bit of height before tossing Pikmin?
Maybe use D-Smashes a bit more?: It's a great move after rolling behind the enemy (or you can roll the dice by trying to grab. I did see you use it more often around the last minute of the match, and the match fared better for you, eh? :D)
U-Smash? You used it quite a lot, which is good, but why not abuse it a bit more? After all, this is Olimar's coup de grace (His knockout move)
Shield+Grab? Great move when your opponent is dash attacking you. Similiar to comments above: Olimar's grab is one of the best in the game (If not the best). Personally I like D-Throw (follow up with F-Air) because you can follow it up well. U-Throw KOs at 150%, but B-Throws are the bestm especially with Blue Pikmin. Try to use that a bit more, and you'll be fine.
(P.S. I saw a Corneria match between you and Kirby. What luck! I believe this is Olimar's best stage! Camp at the Dorsal Fin (the hill) and you are virtually impregnable! Toss Pikmin while opponent is approaching and when he comes close, grab and throw him away. Remember, you can also Pikmin Chain to the tip of the Dorsal Fin if you are in trouble).
Keep up the good work, my Falcon Pikmin friend!