Fletchinder is going to be an absolute boss in ORAS RU. It didn't gain anything through the tutors, but with new Megas such as Sceptile, Lopunny, and Beedrill combined with the newly improved Pangoro and Slurpuff, Fletchinder is going to be a fantastic catch-all answer to all of these Pokemon. Its Priority Acrobatics will be an amazing revenge killing tool to defeat Mega Lopunny and Mega Sceptile, among others, as well as Slurpuff to stop it from Unburden sweeping. It also still makes an incredible late-game win condition as with Acrobatics alone, at +2 this thing absolutely will wreck as usual and it has Will-O-Wisp to cripple the newcomer Mega Steelix as well as good old Rhyperior. This thing hasn't changed at all, but the metagame will, and Fletchinder is going to take advantage of it.
I don't know about you guys but I'm really excited to use this thing in ORAS RU. It got much better now that it has STAB Outrage to use, and it is going to be quite good imo with its DD set. It can use STAB Outrage to just hit stuff hard and will just wreck stuff now that it has a strong, powerful STAB move that has great neutral coverage, even moreso than EdgeQuake. Now Tyrantrum can just sweep using sheer power alone. It can run something among the lines of DD/Outrage/Stone Edge/EQ or something and sweep like a boss. This will be an even better late-game sweeper than it is now and being able to check Fletchinder and Moltres is still as useful as ever. CB sets and maybe Scarf both seem pretty strong too. I definitely think Tyrantrum will be a heck of a lot better now and I'm really psyched to use this.
As a huge fan of Slurpuff, I was really excited to learn that this thing gets Drain Punch now! The Belly Drum sets got better now, and the CUPCAKE OF DOOM will now bring even more doom to teams now that it can smash its way through Registeel, Magneton, and most Steel-types now except Doublade. Not only can it deal solid damage to Steel-types now (which hence makes it even harder to stop), but the recovery from Drain Punch will help Slurpuff a lot. If Slurpuff can get its KO on something like Registeel, Slurpuff can now finally heal off the Belly Drum damage outside of the Sitrus Berry, so every time this thing clicks Drain Punch it can get to a reasonable health so now it's harder to revenge kill. The Calm Mind set is still quite decent as always. I'm gonna love this thing now more than ever, I'm definitely gonna use this CUPCAKE OF DOOM a lot as soon as ORAS is released.
I'm not going to reiterate what everyone else said about this panda but Pangoro is going to be fantastic in ORAS RU, and I wouldn't be surprised at all if this thing joins the RU crew. It got Knock Off, Ice Punch, Gunk Shot, and plenty others which makes it a fantastic offensive Pokemon, with great overall coverage and good bulk making it a monster of a Pokemon, much like a physical Clawitzer. Parting Shot is also clutch stuff. Also it's a panda, and you don't say no to panda. #neversaynotopanda
This thing is a cool mon, and having Refrigerate Hyper Voice as well as Earth Power is definitely really cool now. An LO+Rock Polish set will definitely be decent, and Aurorus hits hard with Refrigerate Hyper Voice. It also finally has nice coverage in Earth Power to smash Delphox and other Fire-types in RU so it'll definitely be a viable threat now. Too bad it has the worst defensive typing ever...I find this mon really interesting both competitively and aesthetically.
Other than that, Delphox, Aromatisse, and Clawitzer gained pretty much nothing, and Malamar got Knock Off but it's still ass lol.
Anyways, I'll post about some other Megas later, just wanted to give in some thoughts about a few of the buffed mons.