Get ready for this thing to destroy your life. Incinerate (121) and Leech Life (131) or Struggle Bug (121) along with Quiver Dance and Gust (111), Hidden Power Ground, or Giga Drain (76) makes Volcarona a potentially big threat, bigger than before, with a HP draining STAB move and a 100% accurate Fire Blast. It will need HP Ground for Heatran, except then Multiscale Dragonite gives it trouble. Either way, with its counters gone, things are gonna die.
Before, Jolteon had a pretty limited movepool, but now it runs Thundershock (111), Charge Beam (101), Volt Switch (81), Mud-slap (131), Stored Power (121), and Signal Beam (76). Swift (91) and Shock Wave (91) are perfect accuracy moves, but Jolteon won't be living many Mud-slaps so it probably won't need to uses them. Also, don't forget that Stored Power gets
weaker now with the more boosts it has, so running it with Charge Beam isn't a good idea (unless its choiced).
This guy? Well, you would think Technician has taken a huge loss with the reversal of lower base power attacks, but for Ambipom, it hasn't thanks to a mainstay of its movepool: Double Hit (58). With Technician factored in, each hit is 87bp... meaning the attack together has 174bp
before STAB. It still has Fake Out (40), Pursuit is either 111 if the opponent stays or 82 if they flee (111/2=55x1.5), plus Acrobatics lowers to 48 without an item, meaning it then gains the Tech boost and goes up to 72. If it holds an item, it will stay at 96.
Rock Smash (101), U-turn (91), Astonish (121), and Knock Off (131) are good choices for their consistent output.
Physical Dark-types got such a huge boon in Power-twist it would be irresponsible to not bring up Weavile. Knock Off (131), Thief (111), and Fling (?) can make Weavile such a badass now. First of all, Knock Off is hugely powerful and disruptive. Second, Thief with a Dark Gem will boost the attack and then steal your opponents item in 1 turn. Third, Flinging a Choice Band gives a 141bp move, which, if I'm right, means the attack is boosted by the Choice Band while it's flung (could be wrong). Avalanche (91) hurts as long as Weavile moves first, and in most cases it will, plus there's Feint (121), Double Hit (58x2), Ice Shard (40), and Rock Smash (101).
What are some more?