My favorites! It was surprisingly difficult to pick for many of these categories, but others were no-brainers. I tried to avoid doubling up on the same Pokemon in a generation, but sometimes there just wasn't another good pick for a type so I just chose it again. There are a lot of blanks for later generations because I either didn't play them enough to really discover favorites for a particular typing, or in the case of 7 and 8 didn't play them at all. I know this is a very unpopular opinion, but I set Espeon as shiny here because I actually really like its shiny sprite. It was also the first shiny I ever saw in any game (a trainer in the Fire Red Trainer Tower has a shiny Espeon), which is a major reason as to why I like it as much as I do. As for gen 7, I have no idea what that giant block thing is, but as soon as I saw it I just had to set it as a favorite. I don't know if it's actually any good or not, but I like it either way!
And yes, I do like Simisage. And yes, it is my favorite from gen 5. I know the elemental monkeys get a ton of hate, but I personally really like them. Pansage/Simisage was the first one I had in my first ever playthrough of Black and ended up becoming a cornerstone to my teams in that game even if there were statistically better Pokemon to choose from.
And then you have my team. It really shouldn't come as a surprise to anyone at this point. Buizel is just plain awesome!
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Edit: After taking a bit more time with this picker, I was able to refine my list a little more and came up with a more accurate version of my favorites: