Ok, so :
As Squirtle, don't land with a Fair if your opponent is standing on the ground unless you are sure to hit with it. This is highly punishable (0:36, 1:58, 5:44, etc...). You can Fair to punish though (0:53, 1:03).
Don't use shellshift + UpSmash with Squirtle unless it can kill (you got punished at 2:40, you had almost nothing to win ; DSmash would have work). DSmash is better in most situations imo.
You avoid Arrows like a boss!
3:28 : Why watergun?
2:06 and 3:56 : Awful spacing <3
4:30 : Don't use FSmash with Charizard unless it can kill. Maybe that was supposed to be a Bair?
4:36 : Never Glide against a Pit/Falco. They can hurt you really bad with their quick projectiles. I'm not sure but I think a Glide Attack can clank with an Arrow (or outprioritize it).
4:46 : I believe that was a wavebounced RS (to hit behind you with the shards)? If not, you suck.
You didn't use Ivy at all. You don't like her? But why using Zard during the last stock and not switching to Squirtle?
Also, don't airdodge into your opponent, you got killed a lot because of this. Remember, airdodging isn't all about the invincibility frames, you can also use your mobility to escape during it. ^^
On Frigate Orpheon, I didn't understand why you choosed to die with Ivysaur and not Squirtle. Weird switch strategy, but it's okay, I guess.
Remember that you can zero switch on the moving platform (2nd transformation)
Also, you can SDI Pit's FSmash.
You seem to have some problems against Olimar. He shuts down your approaches, so you keep getting punished.
Try tricking your opponent into thinking you're going to Fair while landing (airdodge + retreat / double jump instead), and try to punish. If he tries to pivot grab, don't fall into it and force him to pivot grab until he has no room to pivot grab, then punish his roll or watergun him to the edge so that you can punish his ledge options. And hopefully get a lucky Fair/Dair for the gimp.
Nair is good at killing pikmins on you. You don't care about having pikmins on you, if you can punish him for using his SideB next to you, do it!
11:05 : Use BReverse OoS!
11:20 : ... Yellow pikmin throws have almost no hitstun... Don't keep mashing after you're throwed!
I think that's about everything I can say, I don't really know the Ivy/Zard MU against Olimar.
I really really like your PT, especially your Squirtle.
Edit : Oh and I'm sorry, bad english is bad...