I don't think you need an item but if you do then it probally be a fire.(level up not item)
You can evolve slugma by simply leveling it up.
Yes, Slugma will evolve into Pokémon Colosseum. Slugma will evolve into Magcargo.
Slugma evolves into Magcargo.
Slugma evolves into Magcargo.
Slugma evolves at level 38
magcargo.
You'll need to evolve it from Slugma at level 38.
Slugma have always evolved at level 38.
Slugma is a Fire Pokemon with a 24.8% catch rate. Once it reaches level 38 it can evolve into Magcargo.
at level 38
lv.38
Capture a Slugma on route 113 and evolve it c: