Miltank, in hope that she wasn't reserved or done.
Miltank@Leftovers
Impish
252 HP 212 Defense 44 Speed
Body Slam
Milk Drink
Heal Bell
Focus Punch/Earthquake/Fire Punch
Alright, last move is kinda complicated.
As you guessed it, they're built to take on steel types.
However, Earthquake will miss Skarmory/Bronzy,
while Focus Punch and Quake both miss Gengar, rendering her useless against him.
[UNLESS you opt for Scrappy ability, in which case you have to opt for Quake/Punch]
Ability.. I'd say Thick Fat to make her more useful as a tank thing,
but it's up to you.
Miltank@Leftovers
Impish
252 HP 200 Defense 52 Speed
Counter
Milk Drink
Seismic Toss/Body Slam
Heal Bell/Whatever
Kinda awkward, but supposed to work like counter Blissey.
She's fast, though, so she can recover the HP back.
You can ditch some Defense EVs and put them in speed if you want.
Miltank@Leftovers
Impish
252 HP 200 Sp.Def 52 Attack
Curse
Return/Body Slam
Heal Bell
Milk Drink
Scrappy ability most likely.
Pretty straightforward.
This pretty much sums Miltank up. Heal Bell, Milk Drink, fill the rest with whatever you want.
There's always a few gimmicks, but frankly, that's pretty much the reason you wanna use her.
Other options like TWave and Ice Punch work, too.
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