This can be done at lower levels and without Dimo by switching to Alanky on Turn 4 and using invincibility/rampage then swap to Trago and Invincible/Rampage/Stun then repeating until Miragaia dies. The goal is to get Miragaia to <1000 hp with Tragods final hit. This can be done even with Miragaia (possibly) healing every 3 turns thanks to constant Invincibility and Tragod's final death combo of Stun + Rampage. Once Miragaia is <1000, Sucho takes it out with a Null Impact to break the shield, then Lethals the Kentro, dies, then Stego (or whoever) comes in before switching back to Alanqa as Kentro bleeds out.
It goes like this:
Turn 4: Swap to Alanqa, Tuo dies of DoT, Mira comes out
Turn 5: Long Invincibility, Mira Shields
Turn 6: Rampage, Mira Shields (~3000 hp)
Turn 7: Swap to Trago, get hit by 985 Shield (but still no dino losses), Tragod counters ~80 hp
Turn 8: Invincible (+ 80 counter), Shield
Turn 9: Rampage ( ~700 shielded+80 counter), Stun, stunned (hopefully) (~2100 hp)
Turn 10: Stun, [Stunned] (~1800 hp)
Turn 11: Rampage vs no shield, Shield + Counter = Tragod dies (~500 hp)
OR Turn 11: Swap to Alanqa, Shield then repeat Steps 5-11 until Miragaia dies or is <1000 HP after Tragod dies.
Turn 12: Sucho Null Impact to break shield and Kill Mira, Kento comes out
Turn 13: Lethal, Thago kills Sucho (note: if Sucho's health is above 1702 then use Distract then Lethal then Distract to win)
Turn 14: [Your choice] A Tank with Shielding (Stegod) can outlast the Kentro as it bleeds, A Tank Buster with HP >3300 can do enough damage so it dies on this turn, or Alanqa can use Long Invincibility and outlast them.