Well I can't think of anything as far as type changes, but I have a list of 17 fusions.
I MIGHT request a type and color change for a few grass pokemon. Why grass? Ever since silver I started with grass types.
Wow. That's a big list.
Now I'm REALLY thanking you for holding onto them.
Some grass type changes sound interesting...I just thought of one that I should really do. But if you don't request it, I'll do it on my own time and have it be a surprise, so I won't tell you unless it ends up being one you request.
And I started with Grass since...well, I started with Charmander first in Red, and as I explained earlier in the thread, Misty made me restart my game. Then I started with Squirtle and I don't remember what happened...Bulbasaur was the first one I actually made it through the game with, and the only one in my Red Version. Ever since that, I started with Grass the first time around except for this time, in which I got all the starters but technically started with Piplup. If I had been able to choose between the starters, I probably would've just used the one starter, but it was between a turtle and a grass type, to boot, which had been my tradition thus far; a penguin, which is not only cute and adorable but has tons of resistances and only a few weaknesses; and a fire monkey, which is the only fire type in Sinnoh besides Ponyta before you get the National Dex. I'm not a fan of Ponyta, so...yeah.
EDIT: Are you just talking about the handheld adventures? If so, then...
1st gen: Red, Blue, Green, Yellow
2nd gen: Gold, Silver, Crystal
3rd gen: Ruby, Sapphire, Emerald
Fire Red, Leaf Green
4th gen: Diamond, Pearl, Platinum
That's all.
EDIT: I completed Gengar w/ Hat.
Also, on a side note, (and this will probably jinx us, but) I just noticed that this is one of the only threads with intelligent tags and no stupid ones like "*instert name here* was here".