Pokeseba as a general rule you can only request
ONE team per week. I have decided to still give you both teams (Though I had to cut Florges), but in the future if you wish to have another team wait till a week has passed before providing another core. It is also helpful for us builders to provide two Pokemon cores, so issues like the Florges thing is avoided.
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As requested here is the first team around Mega Steelix, Sylveon, and Suicune. I changed this Suicune set to Crocune to be able to handle Scizor better and Pressure is always the best ability as general advice. Anyways Latias gives you a secondary Fighting resist that can also pressure opposing Suicune and Slowbro that can be annoying. Latias and Suicune in conjunction with Toxic Spikes from Nihilego helps you out with the Stall matchup. Nihilego also gives you a Flying-type resist to better handle Togekiss etc. I suggest HP Ice to deal with Gligar, which can remove hazards easily against both your setters. Finally, Scarf Hydreigon for some speed control and it has Defog to remove hazards if needed.
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As I mentioned I had to cut Florges because you wanted Stall, but the Mon just does not fit on this archetype so hopefully you are still fine with this. I gave Aggron Fire Punch to deal with Scizor. Blissey is now your Heal Bell user to remove status. Alomomola was added to give you a Wish passer and secondary response to punish Scizor + Fighting types. Gligar is your primary check to Lucario, Terrakion etc. and gives you Defog support. Pyukumuku is a broken ass Pokemon that checks other threats like Togekiss, Infernape, and NP Lucario. Block Sets help vs opposing Stall and removing other bulkier stuff. Hydreigon gives you the Crawdaunt matchup you lack and also helps you beat the newest addition to the tier being Mew. Fightinium Z Superpower lets it deal with Blissey, Empoleon, and Daunt. Double Defog is nice for Stall teams to keep hazards off.
Hydreigon -> OU sorry for the delay, I still needed to test around with this Pokemon myself before making a team for you.