This is quite tough, all the teams are really good.
Team 1, looks very powerful and very threatening to opposing HO teams, however, the weakness of SR is noticeable having only Azelf as the taunt mon, but you overcome by pressuring opposing Excadrill with everything, I am more concerned about bulkier cores such as SR Clef + Cofagrigus teams.
Team 3, looks almost like something I have made in the past, using the same tech with the Eject Button Slowbro and Sub Seed Serperior, I love the aesthetics and comfort this team feels based on experience. However, I would like to point out the stall MU which could be a bit difficult.
Team 4, I do like how it looks at first on paper, but I was a bit curious about why not opt for Final Gambit on Victini to completely remove Slowbro and Clefable while also heavily denting tank chomp for Bisharp and Lopunny. But the overall nice team, the mons are fine but I would personally change some things.
Team 5, Very cool usage of Specs Starmie, quite an underrated pokemon in general and very difficult to switch in on, and I love how it can support Dragonite by taking advantage of tricking an unfortunate Clefable. One noticeable error is the Trace > Magic Guard on Alakazam, I would only fear opposing Excadrill and I see you have an answer by trading with your own Excadrill, but another solution I would suggest is eject button fairy lock Klefki and then blast them away with your Starmie, or ensure a trick without fear of the opponent switching vs a Clefable. Looks like a fun team.
For this matter, I will choose team 1, Mega Zard X is a difficult pokemon to build around and this type of team is a way to showcase the classic offensive core of Breloom + Mega Zard X and how they link into one another.