I typed this up in notepad so I apologize if it's a little messy, at the same time I tried to make it concise.
Basically here are some things you could visualize in team preview:
Sanguine:
Volt Turn+SR will be hard to stop
if the azum is BD it can potentially win with ferro removed by mag+blastoise weakened, you can utilize the fact that blastoise comes in on heatran to spin rocks
in order to this
make sure you have something to beat florges all the time
Lukey:
Doubling with hazards up can allow you to damage the opposing team
if glisc can hit waters, that can be useful for blastoise as it is probably the most threatening member, darmanitan
can also weaken them with correct prediction, if you get it in a lot it gets more chances to do this
Now the battle:
Sanguine's Lead Heatran. This is an okay lead, if it were a subtoxic glisc or blastoise lead then luke
gets momentum and it would be a bad start, i think rotom-w might be a better lead, it will probably force him into
florges which will make him lose momentum
Lukey's Lead: Darmanitan. This works, you can uturn out of anything or get the chip with a flare blitz, i'd probably
lead this also
Turn 4 I think you should have gone to heatran rather than beedrill so you can start chipping blastoise with toxic or
lava plume burn or whatever
Turn 5 he wouldn't leave in his florges because he gains nothing from it, U-Turn would have given more momentum
Turn 10-Alright nice you trapped the magnezone, this helps azumarill a lot when it's doing more damage, if you can get it in more often that's good.
Turn 13-Beedrill is the better switch here, Magnezone just invites in Glisc which gets chip damage on your water types that
you want to preserve, Luke will never leave florges in on beedrill [even if he does you have 2 steels to switch in] so you
get a free uturn out every time. When you do this, Luke is caught in the dillema of sending in Glisc, which invires in Azumarill, or
getting big damage on one of his healthier offensive pokemon, so it would put you in a very good position
Turn 15-Yeah this is rough I guess. It's the consequence of sending in Magnezone instead of Beedrill, it's now a prediction
that you have to guess correctly. I feel like Latias might have been a decent choice to send in but raikou could become problematic
if heatran gets weakened later on, plus you dont want sr on your side of the field [in fact id try to remove it asap, since
ferrothorn is dead]. i would have gone heatran on the second flare blitz so you can preserve rotom though, darmanitan
are almost always choiced
Turn 18-Alright nice, we toxic'd it. This is a good step towards winning
Turn 19-Another tough prediction. Honestly it's tough to call because he can afford to NOT hydro pump. Latias
252+ SpA Mega Launcher Mega Blastoise Dark Pulse vs. 72 HP / 0 SpD Latias: 236-278 (73.9 - 87.1%) -- guaranteed 2HKO lives a dark pulse though,
so you could get the defog off and get momentum back. if you're lucky he doesnt risk his blastoise and goes to florges, so you are able to keep
latias. not sure about saccing azumarill since it's your last gliscor switch and still does some damage to his team
Turn 20-I probably would use play rough here, it's free and will probably ohko/2hko his whole team.
Turn 25-Same scenario as before, I would go lati>azum since with azum gone you cant break gliscor
Turn 29/30-Good prediction on the florges, but I wouldnt leave it in on raikou here because latias is really your only
hope to break gliscor, it's also now able to drop draco meteors once florges is gone, it's probably your most valuable
team member at this point in the game
Turn 33: I'm not sure you could bring it back at this point but I guess for the sake of saying it, it's better to sac latias
here since its dead to SR
With the game ending shortly after. It was a close game, but I'd just be considerate of which Pokemon can do the most damage to his team, and therefore should be the ones you would try to preserve, while choosing the
less valuable ones as sacrifices.