They live as a group, but when the time comes, one strong Meltan will absorb all the others and evolve.
Meltan is a Steel-type Pokémon. It takes double damage from Fire, Fighting and Ground, resists ten types, and is immune to Poison. Its base stats add up to 300: the highest are Attack and Defense (65) and the lowest is Speed (34).
It does not evolve, and no other Pokémon evolves into it. Its ability is Magnet Pull. It cannot breed: it is in the Undiscovered egg group. In Sword and Shield it learns 7 moves by level-up and 13 by TM.
BASE STATS
EVs on defeat:
Attack +1
ABILITIES
Prevents Steel-type Pokémon from fleeing by pulling them in with magnetism.
BREEDING
MOVES
WEAKNESSES & RESISTANCES
EVOLUTION LINE
This Pokemon does not evolve