It is not a move it is an ability, it always will have flame body.
Slugma is a Fire Pokemon with a 24.8% catch rate. Once it reaches level 38 it can evolve into Magcargo.
Slugma evolves at level 38
at level 38
Slugma evolves into macargo at level 38
Slugma evolves by Level at Level 38. It evolves into Magcargo.
Level 38.
Slugma have always evolved at level 38.
38
at level 38
Level 40
Level 38.
Level 39