As with previous games, you can return to the Pokemon League to challenge the Elite Four again and again, which is one of the best ways to earn experience points and get your coveted Pokemon to Level 100.
During subsequent rematches with the Elite Four, their Pokemon will be slightly stronger (Level 63 instead of 54 to 55) and have better moves. But if you've been diligent with the postgame sidequests, they shouldn't pose too much of a problem.
Rather, the biggest difference is after you defeat the Elite Four and reach the Champion's seat. Upon sitting on your glorious throne, rather than facing Kukui once more, you will face off against your cheery rival, Hau instead.
After that, each time you reach the end of the Pokemon League, you will get to battle 1 of 10 random challengers, which include some familiar faces, such as Kukui and Hau, and some not-so-familiar ones.
By this stage, you should have all the tools necessary to defend your title. But if in doubt, you can refer to our lists to see what Pokemon they'll send out and formulate a battle plan from there. For reference, their Pokemon range from Level 59 to 65.
|Hau||Raichu (Alolan), Jolteon, Flareon, Vaporeon, Komala, Crabominable, Primarina, Decidueye, Incineroar|
|Sophocles||Togedemaru, Magnezone, Electivire, Vikavolt, Golem (Alolan)|
|Ryuki||Garchomp, Drampa, Turtonator, Dragonite, Kommo-o|
|Gladion||Crobat, Weavile, Porygon-Z, Lucario, Silvally (Fire, Water or Grass)|
|Molayne||Skarmory, Sandslash (Alolan), Magnezone, Metagross, Dugtrio (Alolan)|
|Plumeria||Gengar, Muk (Alolan), Crobat, Toxapex, Salazzle|
|Hapu||Dugtrio (Alolan), Gastrodon, Krookodile, Flygon, Mudsdale|
|Tristan||Emolga, Sharpedo, Exeggutor (Alolan), Magmortar, Tauros|
|Faba||Slowbro, Bruxish, Raichu (Alolan), Alakazam, Hypno|
|Kukui||Lycanroc (Midday), Ninetales (Alolan), Braviary, Magnezone, Snorlax, Incineroar, Primarina, Decidueye|
As with previous battles, some of the Pokemon you fight depend on which starter Pokemon you picked at the start. Friendly Hau will use a starter that's weak to yours and an Eevee that's strong against yours.
Meanwhile, clever Kukui will use a starter that's strong against yours. Similarly, ruthless Gladion will have a Silvally with a memory chip that's strong against yours.
After successfully defending your title, you'll be sent straight to the entrance of the Pokemon League. So you won't have to sit through the credits roll again or anything like that. A bit anticlimatic perhaps, but hey it saves time!