Triple battle, one poke in the middle and two florges at its sides, it loses its item, and the florges have an item and symbiosis, who would pass their item?
If multiple Pokémon on the same side of a Triple Battle or Horde Encounter have Symbiosis, then Symbiosis will trigger on the faster Pokémon (even while Trick Room is in effect).
So whichever Pokemon is faster that Pokemon's item will be passed over.
Source
Hopefully I've Helped!
