Some stuff I know
pichu's jab is so low peach/zedla can't grab him so you can spam the carp out it on their sheilds
I know about pichu's perfect up-B where you jump and on the first 2 frames you up-B left or right and you slide like a wd and it can easily be broken down into 3 parts(to detailed to talk about right now) very sexy use
http://www.youtube.com/watch?v=FwGl7OSWLao also the first one I used the pc edgehog
um naor at like 40ish on fox they will fall and you can jab reset the crap out of them and f-smash
thunder fhed to f-smash is a combo easy to do on fox on FD
SHffl upair on fox/falco/falcon to set up smashes and grabs (no higher than 60% on fox)
if they don't di on up-throw chain throw up-tilt before uyou grab for extra damage.
if you dair on a platform it has way better range than one would think
jump up on platform(top) wait to be upaired sheild and up-B down to punish the lag
I also know and have mapped out many up-B tactics for on stage approach
I know more but yeah. Hope you post on the pichu boards needs to be more active