It's Super Effective - Meltan is a Steel-type Pokémon with a body made mostly of liquid metal, which makes its shape very fluid. This Pokémon can use its liquid arms and legs
Top 10 Non-Legendary Steel Pokémon - LevelSkip
Steel (type) | Fantendo - Game Ideas & More | Fandom
Steel-type Pokemon weaknesses, resistances & best counters explained - Dexerto