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It's not that difficult. Kanga just makes everything easier, but it's definitely manageable with other teams too. Here's a quick recap of what I've used and the approximate win streaks (I don't remember the exact numbers):
Singles:
>M-Kanga / Milotic / Reuniclus (balanced Kanga-based team, 80+)
>Garchomp / Milotic / M-Scizor (just a regular balanced team, 50+)
Doubles:
>M-Kanga / Togekiss / Jumpluff / Thundurus (Follow Me and priority T-Wave, 60+)
>Greninja / M-Abomasnow / Terrakion / Scizor (Blizzard spam with backup Mons, 160+)
Triples:
>Landorus / Stoutland / Hippowdon / M-Tyranitar / Excadrill / Garchomp (sand hyper offense, 50+)
>Charizard Y / Typhlosion / Aerodactyl / Delphox / Ninetales / Pyroar (sun hyper offense with Wide Guard support, 120+)
Rotations:
>Hippowdon / M-Garchomp / Excadrill / Tyranitar (sand hyper offense, 50+)
>M-Kanga / Milotic / Aromatisse / Crawdaunt (Kanga + Trick Room, 50+)
Multi:
>Charizard Y / Terrakion with AI partner's Typhlosion / Archeops (sun hyper offense with backup, 120+)