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s-This will make the spawned Pokémon shiny.
boss1-This will spawn you a boss level 1.
boss2-This will spawn you a boss level 2.
boss3-This will spawn you a boss level 3.
Just look at the commands from the wiki. If you want a shiny Jolteon now for example you just write : /pokespawn Jolteon s
And he should spawn. Note that you can't use two boss level at once though but you can get shiny boss pokemon who drop a lot of loot if your intend is farming TM or Held Items.
Or /spawn <pokemon>S For a shiny of that type