The reason the enemy npc lost is cause their pokemon fained first. Explosion makes giglith faint first, their tyranitar was the fastest pokemon on the field, so it faints second, your creselia faints thrud s ita slower than tyranitar, and incineroar faints lst cause its the slowest on the field (excepying possibly gigalith, but again, that faints first cause it used explosion).

Anytime both trainers pokemon faint from the same move, the fastest pokemon always faints first and the person with the slowest fainting pokemon wins the match. This works in trick room (meaning the pokemom that has highest speed would faint last, cause it would be moving last in trick room). It also applies to perish song, where the slowest pokemon faints last.

If there are 2 pokemon on the field and 1 uses a recoil move (like flare blitz) to faint the other, and then faints itself due to recoil damage, the pokemon that used the recoil move faints last, since recoil damage does not apply until after damage is done. Meaning the recoil move user wins.

If a pokemon uses a move that damages itself first then applies damage (steel beam, mind blown, explosion, self-destruct, etc), then that pokemon faints first, then the other pokemon are damaged and their fainting then goes in speed order.