EV Spread and Sets Explanation

Mega Lopunny: 212 HP investment allows it to guaranteed live bulky Tapu
              Fini Moonblast.  Takes a lot more hits than people expect
              and Drain Punch helps with this.  44 Attack investment
              allows it to 2 shot many different pokemon.  252 Speed EV's
              with Jolly nature allow it to outspeed most threats.
              Fake Out plus Protect allows it to stall out Tailwind and
              Trickroom and draw extra pressure.

Tapu Fini: Fairly standard bulky set with Super Sitrus Berry.  Defenses
           are allocated fairly evenly and speed investment allows it to
           outspeed standard bulky calm mind tapu fini sets.

Thundurus-T: Standard 252/252/4 EV spread with Timid nature.  101 base
             speed allows it to outspeed many top threats in the meta
             including Zapdos, Mega-Kangaskan, Landorus-T, and Charizard.
             Nasty Plot allows it to set up effectively as a potential
             lead with Mega Lopunny.  Thunderbolt with the Lifeorb item
             OHKO's standard bulky calm mind Tapu Fini set.  HP Ice
             threatens top meta threats like Landorus-T and Zapdos, and
             allows it to usually 2 shot Tapu Bulu and Amoongus as well.

Aegislash: Fairly standard set with 252 HP, 252 SP. Attack and 4 Defense.
           Ghostium Z Shadow Ball OHKO's top meta threats like Cresselia
           and Gothitelle.  Standard shadow ball almost always OHKO's
           Mega Metagross and Tapu Lele.  Wide Guard gives it a lot of
           useful versatility.  Quiet nature with 15 Speed IV's gives it
           a solid speed tier, but this can be changed for personal
           preferences.

Tyranitar: 252 HP EV's with 108 Defense EV's allows Tyranitar to allows
           survive a Mega Metagross Iron Head.  Weakness Policy turns
           it into a massive threat and allows it to draw significant
           pressure.  Adamant nature with 148 investment allows it to
           threaten very similar damage output to max Attack EV's.

Kartana: Standard set with Focus Sash.  Tailwind provides unexpected
         utility but this can be swapped for Swords Dance as well.
         I personally prefer Tailwind after testing both.  Kartana is
         very useful as a late game sweeper catching Sand and Rain teams
         at the end of their weather control.