It is obvious that you have put a lot of time and effort into this guide, and there is some very helpful advice in here that has improved my dedede game immensely (i.e. Nair fast fall, short gordo + Fsmash edgeguard, and Dthrow combos), however some of the advice you gave in this guide just doesn't seem to work for me. I know that all of this is most likely just lack of skill on my part, but I felt like I should mention it. Firstly, Your strategy of waiting for your opponent to charge, then dodging and counterattacking seems to work on very few people. Most characters either are too fast to dodge in time reliably, or play on the defensive themselves, pelting me with projectiles which usually reflect gordos, forcing me to take to the air, where I feel dedede plays his best. Also, you seem to stress using swallow too much. I agree that it has good uses, but it isn't really one of Dedede's go-to moves in my opinion. Also, while the robin matchup in this guide is a 1, I really think it should at least be a 2, at least for the robins I've faced. There are also a few things I think are worth mentioning in this guide, like how if dedede is being edgeguarded, and your opponent is close to the edge, you can hit them with an up air while safely below the ledge, making them think twice about standing there. On that note, Dedede's up air is fantastic, as it goes through ledges, will still hit someone if they counter it, has a pretty good upwards reach, is a fast move, hits even at Dedede's hands/belly, and can KO early near the top of the stage. Also, it is worth mentioning that a down tilt can hit back a reflected gordo without much skill involved in timing. Overall, however, this is an excellent guide! I love the individual character matchup tips, the detailed analysis on the effects of each of Dedede's attacks, and the large amount of content! Easily the best dedede guide I have found yet.
Edit: after playing dedede for a while now, I take back everything I said about swallow. It is an amazing move that covers your landings, is great to use when you want to see what your opponent will do, and can not only end combos, but start some when opponents react predictably once spat out. Also, you say that you have no more fives to give out, but what about sonic? Do you not have trouble with him? If not, I would really like some advice on how to touch him.