There are so many RNG Moments that some seem possible to remove while others don't. I think I learned some ways, but not 100% sure. This Comment will be edited when more info is found.

Movement/Battle Cards: This is RNG not worth trying to removing. I've seen a TAS or 2 even having trouble with this. This goes for both you and the enemies. RNG too strong here.

Enemy Encounters: This is where most time can be saved. I think I'm slowly on to something here. Seems that being on a Water Tile or closer to the Boss of the Map makes stronger encounters happen more often. This might not be the case however.

7-Card Item match Mini-game: This is something I think could be messed with. Sadly the only thing I've noticed is that the Bulma Item Card seems to appear a lot. Bulma heals so little HP that it's basically a waste of Inventory Space. Need More chances of Escape, Korin, Chi-Chi, and Gramp Gohan Item Cards.

Rock Carry Mini-game: There are 4 different versions of this. Rock Carry(Everyone can do), Snake Road Rock Carry(Goku), Bubbles Rock Carry(Goku), and Gregory Rock Carry(Goku). Even thou they play all the same, because the names are different, I think all 4 have a different RNG Path. Combine that with the fact you use the Movement/Battle Cards, you can't trick this one.

Just gonna post this instead of editing the previous comment.

The 7-Card Item Matching game is somewhat figured out. I found out that there are not that many pattern/setups made for the mini-game. Grampa Gohan is the only card that's inconsistent. He seems to randomly replace a card sometimes in the patterns. He seems to be the rarest thou and due to finding a somewhat easier way to get items you want now, Grampa Gohan is not really needed.

Now also due to figuring this out, this also means you can complete the whole mini-game via matching every card. This means the mini-game will allow you to pick any card in the game. This should make the first stage and a couple of middle stages a bit easier. I'll post the patterns later on in resources or something.