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Okay I have an idea for Subway double battles.
Slaking @Leftovers
252 HP/4 Attack/252 Sp.Defense
-Curse
-Double-Edge
-Slack Off
-Shadow Claw/Substitute
His team mate would either be Eviolite Magneton, Magnazone, or Starmie, so they can Skillswap him Analytic.
Double-Edge's 120(STAB)(Analytic)= 234 damage.
The other two Pokemon can take care of Steel, Ghost, Rock, and Fighting types.