RBY: Agreed. Nothing stops RBY Mewtwo (best hope is LS Chansey, or hax crit explosion), and Tarous is unbelievably good with counters for everything with Starmie coming a close second.
GSC: Agree to disagree. Mew is unpredictable, but other ubers in G/S can make their presence felt. Mewtwo still gets submission to take out his counters, and Curse Lugia has the defenses to tank with an amazing recover ability. Curselax is the undisputed king of G/S OU, nothing stops that thing really.
RSE: This is where it starts to get difficult, but I can say with certainty that Kyogre is not the best Uber in RSE. He’s a bitch to take down, don’t get me wrong, but certain factors can impact him big. Deoxys-A power, Groundon’s Drought, Light Screen Latias w/Soul Dew, Toxic Lugia Stall, all these things can ruin Kyogre’s ability to sweep.
If I had to pick I’d say the best RSE uber is probably Wobbuffet because he has answers for everything. He can guarantee you at least one pokemon you can take out, two if you are lucky. For OU, it is agreed everywhere that Suicune is the best. Well, specifically speaking, the Calm Mind version of him. Once he gets rolling, he’s unstoppable.
DDP: Arceus has gotta be the best uber. 120 base everything, multi-types, good movepools, god of all pokemon lol. Latias can check Kygore with its beastly Draco Meteor coming off Soul Dew. For OU, Garchomp no doubt. After his ban, then Salamence. Salamence as a late game sweeper was unstoppable, even if you put him on point he would punch holes in the opponents team. After Mences ban, then Heatran. Heatran is amazing, with checks for everything. He left DDP with the highest usage via Smogon polls.
it still says I can’t connect to the server authorization 
NVM: I didn’t download the update doh!!