For example, before Episode 13 was released, the game files of Episode 12 showed that Adrienne is supposedly next. But then we fought Charolette. Same applies here. No one expected Terra for 14, and yet here she is.
For Ice types, you've got a couple of reliable ways to go.
Tank
There are only really two plausible solutions here and one of them is far above the other: Avalugg and Walrein. Let's break it down a bit more.
Avalugg: Have you seen this defense? And that attack is nothing to laugh at, either. Unfortunately, this glacier which redefines the meaning of "physical wall," has the abysmal base 46 Special Defense. What sort of a tank has that? Butterfree has twice that. So, if you use this, be wary of any special attack at all.
Pros:
Curse
Blaziken? That's cute.
Cons:
Whoops, got killed by a random Oddish's Acid.
Walrein: Extremely balanced stats. All around, quite a decent choice for any party member.
Pros:
Doesn't get murdered by any Special attack
Better for a rounded offense
Faster
Cons:
More weaknesses
And then you have your offensive Pokes.
Attacker
Oh lordy, there are quite a few decent, offensive ice types. And some of them are definitely better than others.
Let's start out with one that people really don't like. Vanilluxe.
Vanilluxe: This thing can actually be obtained before the second gym (or, at least its pre evolutions can be. You know what I mean). This thing has some pretty nice stats, in all actuality. 110 base Special Attack and 71-95 in everything else. That's rather nice and well rounded, if I do say so myself. Unfortunately, it doesn't have the best of movesets. It does learn Ice Beam, Mirror shot, and taunt by level up, though. You could throw Freeze-dry in that last slot, I suppose, just to kill Swamperts and such. Hidden Power could also work out quite well. You can also grab a Steelix and breed Automatize onto it.
Pros:
Nice stats
Decent-ish movepool
Cons:
It's an ice cream cone.
No room for varied sets.
Aurorus: A bit bulkier than some of the other offensive guys, but can still pack a considerable punch with Refrigerate turning all your normal moves into ice. Only problem is it doesn't learn many good Normal moves with the exception of Nature Power-> Tri Attack, which only works with no other field effect present. Yeah. like that's going to happen.
Pros:
Refrigerate boosts all normal moves
Able to take some hits (keyword "some")
Cons:
What normal moves?
Any fighting type attack
Glaceon: This isn't Pokemon: Conquest. Don't use Glaceon in Reborn unless you plan on following in Serra's footsteps or you have a trick room team.
Froslass: Speed+Destiny Bond can be quite deadly on occasions. Just don't die on the first turn (focus sash might help).
Pros:
Destiny Bond
Rather fast
Cons:
Quite shallow moveset. Give it Blizzard, DB, Shadow Ball/Ominous Wind, and possibly Draining Kiss. Not much else you can use it for.
Cryogonal: Pretty solid 135 base Special attack and 105 base Speed, only problem is it dies to a single mach punch. This thing is almost a literal glass cannon, as it will dish out some pain, but then fall shortly afterwards.
Pros:
Dat Special Attack
Decent speed
Nice move pool
Cons:
Speed won't matter much against Reborn bosses because they are too dang fast anyway,
Paper thin defenses.
Phew, that took awhile. Hope this helps somehow and I didn't just rant on the forums and get everything wrong. That would suck.