This didn't take research though. The only thing I had to look up were the final 4 Greymon on my list of them (Rampage, Zeke, Decker, and Megadecker).

Here's the Adventure Evolution chart, completely from memory.
Adventure:
Agumon -> Greymon -> MetalGreymon -> WarGreymon
OR
Agumon -> Greymon -> SkullGreymon
Gabumon -> Garurumon -> WereGarurumon -> MetalGarurumon
Patamon -> Angemon -> Magnangemon -> Seraphimon
Salamon -> Gatomon -> AngeWoman -> Magandramon
Tentomon -> Kabuterimon -> MegaKabuterimon
Palmon -> Togemon -> Lilymon
Gomamon -> Ikakkumon -> Zudomon
Biyomon -> Birdramon -> Garudamon

Why did I type this out (Aside from having nothing better to do)? To show that the series proper almost always kept Evolution lines straight in their own show.
Agumon in Savers/Data Squad had a completely different line, but even then it was kept straight in it's own series.

Yes, there are about 50 different Digimon Agumon can become. That doesn't mean he does so.

In essence, there is a Golden Rule to each series, and that's following the basis of the original games and digital pets. Digimon grow differently depending on their environment.
In Pokemon, it doesn't matter if the Charmander was raised by a loving trainer or had to undergo a rough life living on it's own. It will always become a Charizard. In Digimon, different circumstances yield different results.

Also, you act as though keeping track of all these is a difficult task that couldn't possibly be accomplished by someone who has stuff to do. In reality, this is done by just casually watching the show. I know the GeoGreymon line because I watched Savers. I know of all the different Garurumon stuff because they pop up all the time in other shows.
Of all the Greymon I named, only 2 never appeared in the show (ChaosBlackWarGreymon and VictoryGreymon). Yes, you have a life to attend to. That's fine. But this is all stuff you would know if you just paid a bit of attention to a series.

Digimon Fusion Trailer!
 

Guess what? Saban as announced a brand new Digimon! This season they can combine and fuse into stronger digimon than before!

https://www.youtube.com/watch?v=6KPC...&feature=g-u-u

(Courtesy PRSamuraiCast on YouTube)

I don't like how they changed Taiki to Mikey.

I'll never get over how hilarious Samuel Vincent is as Shoutmon. :lol
Also, that narrator sounds so bored it's not even funny.

Imma be the only one excited for this, aren't I >>

This trailer popped up in the other Digimon thread, so I'm gonna merge them to keep discussion all in one place.

Then I can only assume you've not seen any of Xros Wars.

I loved the Japanese version. But you do not change the main characters from Taiki to Mikey. Sure they shortened Taichi to Tai, changed Daisuke to Davis, and Masato to Marcus, but at least they sounded somewhat fitting. If they kept Takato and Takuya, I don't see why they didn't keep Taiki.

no your not the only one even though i finshed xros was i cant wait for this fustion due to the dub going to be epic hopfully

Not even once. What is it?

Because they needed something English sounding, and they already used Tai.

I don't see how changing Taiki to Mikey is any worse than changing Daisuke to Davis.