Had a few ideas and one weird one.
1. Much later in the game like gen 9 or 10 on the boat the MC remembers when he first started this journey that the ship was so quiet and empty even though there were the Rotom and now compare to now with so many legends laughing, shouting and of so many different types, sizes and species all together that all love him.
2. Had an idea for Lucario that since they can shape aura into different things like the bone staff, a female one decided to change that a little by making the BONE staff thicker, with a almost pointed TIP with some bumps so she can BONE herself. She prided herself on that but once she met the MC and was shown how far and big the transformation could be to diff parts of the body.
3. Had an idea where there is a character that believes the MC has been mind controlling the legends with his cute charm ability to follow him so they found an item and uses it on them thinking that they will be free and grateful that they will go with him instead. It does cancel the charm but does not change anything since the legends really do love the MC and beats him up a bit.
4. Another idea at the end of the game and if ALL the legends have ben collected that Mew two decides to mix a drop of each legends breast milk together into one cup to see how it tastes to the MC. PS it glows with a heavenly aura as if it is from a much higher plane of existence.
5. The weird and strange idea involves Eternatus. Since she is so LARGE a size all her own that when it gets to the side scene of which part to use "Mouth", "Pussy", "Ass" there could be a fourth option "Belly?" that with her size the MC could actually have sex with her belly button.