Finished the game. Elite Four was pretty easy with six level 70s, all with good diverse movesets even in mono-type. Lanturn is statistically a straggler but having Surf, Ice Beam, Signal Beam and Thunderbolt is very helpful. Manectric's Flamethrower was really handy too, as was Heliolisk's Surf.
Just going to prepare for my next game now I think. Gonna get all the battle items and Pokerus for EVing first, then start breeding for either an all-bear team (Pangoro, Ursaring and Beartic) or my nine-Pokemon type coverage team (minimum possible Pokemon to have one of every type). Proposed for that is Dragonite, Scizor, Pangoro, Rhyperior, Lapras (five I'll carry) with a bench of Roserade, Gardevoir, Heliolisk and Chandelure, or possibly even an 'All Speed' Team of Jolteon, Scizor, Sceptile, Weavile and Talonflame. Idea is that I'll get all the eggs ready (natures/IVs etc) and trade them to a new game, along with some mules holding Battle Items, Pokerus, Lucky Egg etc.