This week's massive Pokémon GO update brings 80 new monsters, enhanced customisation options for player avatars and new items - one of which is Evolution Items.

These new items are fairly rare but can be obtained at PokéStops, and they're integral to getting some of the better evolutions in the game.

At the time of writing there are five different stones, and we've outlined what they are and what they do below.

  • Dragon Scale: Evolves Seadra into Kingdra
  • King's Rock: Evolves Poliwhirl into Politoed / Slowpoke into Slowking
  • Metal Coat: Onix into Steelix / Scyther into Scizor
  • Sun Stone: Gloom into Bellossom / Sunkern into Sunflora
  • Upgrade: Porygon into Porygon2

Have you managed to get hold of any of these items and evolve new monsters? Let us know by posting a comment below.