Time to do some math hacking to see what might be in Fates Collide, or at least the Japanese version of it.
There's going to be 5 Grass Pokemon, Shuckle being one of them. Unfortunately, we don't know the set number for Shuckle, so it's impossible to math hack.
There are two slots between Moltres and Fennekin. We just got a Numel line, and the odds of a Slugma line are slim. I'm betting on a Darumaka line.
There are two slots between Delphox BREAK and Omanyte. Those could be Fire or Water. If it's Fire, I can see it being a Litleo line. If it's Water, that opens up a LOT of possibilities: Psyduck line, Tentacool line, Seel line, Shellder line, Krabby line, Goldeen line, Staryu line, and Magikarp line. A lot of these have been seen in the last three sets, except for one: the Seel line. My money's on that.
There are three slots between White Kyurem and Alakazam EX. This is where is gets tricky, because Lightning is between Water and Psychic. I can't see Psychic types before Alakazam EX in here, so we'll focus on Lightning for the most part. The amount of Lightning Pokemon that can be in here hinges solely on one thing: Will Black Kyurem be in here or next set? If Black Kyurem is here, that means we get any of the following: Pikachu line, Voltorb line, Chinchou line, Electrike line, Plusle and Minun, Blitzle line, Joltik line, Helioptile line, or any combination of Pachirisu, Emolga, and Dedenne. Of these, I honestly can't see anything making it, as everything's been done recently or we don't need any of them.
As such, I'm betting on Black Kyurem being saved for next set and getting a full Stage 2 line of Electric Pokemon. That means it's either the Magnemite line, Mareep line, Shinx line, or Tynamo line. My money's on Mareep line.
There are two slots between Mega Alakazam EX and Mew, giving us the possibilities of getting Tentacool line, Grimer line, Drowzee line, Exeggcute line, or Koffing line. It's gonna be the Koffing line, we haven't gotten anything out of them in ages.
Like the Grass types, every single known Fighting type has an unknown set number, so math hacking is impossible. Although given the sheer amount of them, I can see them being the only ones we get in the set, since a lot of Fighting type things are gonna be in the Zygarde EX Deck.
However, there's still 6 slots unaccounted for between Grumpig (29) and Umbreon EX (42). Since Umbreon's the first Dark type in the National Dex, there's no Darkness Pokemon to come before him. We could very well still get some more Fighting types along with a few more Psychic types, but there's no knowing what they'll be.
Speaking of unknown set numbers, the Bronzor line + BREAK has those as well. Luckily, there's a smaller number between Mandibuzz and Lucario, leaving 1 slot unaccounted for. If it's Metal, that could give us a clue or two on what other Fighting types are in the set. We already have a Fighting to Darkness evolution in Pupitar/Tyranitar, and Riolu to Lucario is Fighting to Metal, but it might not be the only one. We could see Onix and Steelix in here. There's also the chance of Burmy being one of the Grass types, and Wormadam could be different types for the different cloaks, meaning Fighting and Steel as Metal.
And then it turns out to be another fudging Pancham/Pangoro set because @!$% me, right? Not like we haven't had enough of those @!$%ers....
Three slots between Lugia BREAK and Altaria EX. Oh boy, Colorless, my favorite. At least the gap isn't that big...now I just need a Stage 2 line of Normal types....Slakoth...Whismur....y'know what? @!$% it. I'm always wrong with the Colorless math hacking, so I'm not gonna bother with it this time.