Pokémon
Mawile x1
Bisharp x1
Pawniard x1
Meltan x2
Melmetal x2
Trainers
Professor's Research x2
Giovanni x1
Sabrina x2
X Speed x2
Poké Ball x2
Potion x2
Red Card x1
Blue x1
Strategy
Going second, try to get Meltan in there to get some free energy, then get out with an X speed, evolve, and wreck.
Going first, try to rely on Mawile to knock off energy from your opponent.
2 Potions and Blue are uncommon choices, but I think they both pair well with Melmetal's ability. Blue in particular gets melmetal to 160 effective HP, which was very helpful during the Celebi metagame we just went through.
Archiving this deck here, as I will of course be changing it with the new steel types like Dialga EX.