You get to pick one legendary or mythical to help you rule the REAL world

If it's lesser legendaries such as the birds, the beasts, the regis, the lake trio, sea guardians, lunar duo, the genies, swords of justice, the tapus, treasures of ruin, etc. you get the whole set (without their masters if applicable so no Ho-Oh, Lugia or Regigigas)

If Kyurem, you may also get either Reshiram or Zekrom

If Necrozma, you may also get either Solgaleo or Lunala

If Calyrex, you may also get either Glastier or Spectrier

No Arceus, no Dialga, no Palkia, no Giratina because they are OP and boring