Kienamaru, you asked me to fill you in on what Pikachu needs. Well...
A) I might just suck with it, but I know for sure at some point QAC was removed and instead he has an attack cancel on frame 2. I thought when I went in it was a jump cancel, but I couldn't seem to jump cancel when I did a QA into the ground. If this is true, I'd kind of like the ability to jump-cancel the endlag too (so it would function like a normal QAC too), but since there is an attack cancel it doesn't have to I suppose (and if it's got one, that's me not doing things right I guess).
B) On the same note - I think QA has no endlag, even when done high - try doing it straight up, then when he lands watch him get up, then do it again but wiggle the cstick like crazy as he's landing - you'll do a smash almost immediately. Intentional? It's cool, but...
C) Did you check his side smash shield damage? One uncharged fsmash can almost break a shield - I have pulled off bair someone's shield -> QAC -> fsmash (since the attack cancel) and broken it [though of course acting out of shield would have stopped this], but I don't know if you can QAC -> fsmash someone's shield for a very-difficult-to-dodge shield break [not sure if QA has enough shield damage for this to work]. I have no idea why it does so much shield damage in the first place (it's very unsafe on shield if it doesn't break it I believe), but I think you should check it out if you didn't know about it. Also, as a Pikachu player I kind of like it, but it just strikes me as bizarre whenever it hits a shield...
D) On the topic of fsmash, I've had people SDI Pikachu fsmash to avoid the KO - can we go to the angling/non-angling method for his fsmash again so fsmash can always have the strong hit landed when needed? I don't need a multi-hit fsmash that can be SDI'd at 200%, I just want the single-hit KO, but that occasionally happens. Same problem for >75% Lucario I believe. If this is just a general design choice though, it's fine (that is, if people want multi-hit fsmashes for everything, ok).
E) I don't exactly know what Pikachu needs per se... I think he's solidly built as is in Minus 3.Q, and it seems you only buffed him. I'll see if Sunderstorm will agree to try this build out I guess...
On the topic of Falco:
From a glance, you seem to have increased his ability to convert on what he gets, but made it harder for him to get in. I think in Minus 3.Q he has a few options, but most of his close ones rely on reflector for safety. That may make him too safe, but considering his easy of comboability and light weight, I never really thought so. Dsmash being buffed is kind of nice, but that's the move I use least for KOs - I usually get them with some sort of fsmash read or an upsmash (Brawl Falco mode I guess). Or a fair chain. I'll see how he plays now if I get this and tell you what I think.