Alright, manaphy, darkrai, shaymin-s are still just as broken as they were previously. There is nothing new in this generation that truly shutdown that didn't exist previously in some form in the last game. Everyone keeps talking about outspeeding and OHKO manaphy with an electric/grass attack. Well, i run Wacan berry manaphy, so i force a switch and tail glow, and when i see lati@s or jolteon and they use their SE electric attack i just laugh and OHKO back and then wreck their team. I have came across some people who do have 2 electric users, but i just killed a powerful pokemon on their team and it leaves another member of team open for attacking. Overall, still broken and remember their is still pokemon on his team, so if someone brings a grass user, i switch to my next pokemon that i about to discuss shaymin-s,
Shaymin-s is still faster than any none scarf/speed-boosted pokemon and with air slash/seed flare alone can wreck EVERY pokemon. The only pokemon that may survive are still and then he carries earth power to handle them. If he is running a defensive set (leechsub) then priority counters will get destroyed when trying ot handle him One on One. I haven't found any true counters to Shaymin-s
Darkrai had counters in the previous game in the forms of scarf primeape/heracross or sleep talk heracross(beast), yet he was still banned to ubers why, unless you ran a specific counter to him, he would destroy teams alone. In this gen, with roobushin most people think darkrai is still no threat, you take a sleep hit, and then switch and hit with SE mach right? nope darkrai has surprising bulk to survive a mach punch, and my darkrai holds chople berry(i think) which weakens fighting hits, and has psychic(lame right) to counter them with. Even without nasty plot he still takes out 2-3 pokemon through sleep and KOing before dying.
Overall view, they are still broken and nothing about them has been truly weakened, there are just new pokemon to slow them down, but overall they will wreck the metagame alone.
As of weather, i think the abusers should first get looked out followed by the inducers, and thats for every weather. In gen 4 i hated Sand abusers and in gen 5 that anger only grew with dory. Now he isn't broken, i can take him in out in the sand without losing a pokemon on many of the teams i was testing, but it is just one more reason to add to re-analyzing the weather itself. Most people are crying about rain since they don't have to use rain dance anymore, but it is still just as broken as it was before. Hail is for stall teams, but overall not a huge threat, and haven't seen a good Sun team yet, so i will test one soon so i have some input.
Point- Look at kingdra, kabutops, Dory, Chomp etc before looking at Politoed and TTar. Also, re-analyze what WEATHER (all 4) do to the metagame, several people are too accepting of it to really think of a metagame without it. I am not saying ban it, just to look at if it is overcentralizing in its counters and checks and if it is really healthy to continue using.
Edit: as for MH users against Darkrai, if they become a problem he can easily hold something besides psychic to handle them, or even drop the focus blast (which i suggest) to handle both his counters effectively without lowering his sweeping potential