Revelant TM/HM/Tutor compatibility: Thunder Wave, Block, Stealth Rock
Revelant Breeding Moves: Curse, Punishment
Revelant Level Up Moves: Heal Bell, Drink Milk
With revelant I want to mean "moves that almost no one of it's competitors can learn", Thunder Wave is also learned by Stoutland, Block by Lickilicky, Stealth Rock by Wigglytuff (not considered at all as both are pretty different), Heal Bell by Audino and Lickilicky, and Curse by Lickilicky.
1. Don't use Miltank with Thunder Wave most of the time, Stoutland can actually use it a lot better because he have Intimidate, so, he can switch-in better and spread paralysis, and he can even parashuffle because he can phaze, while Miltank not. Also, Stoutland have less speed, so, he'll take more advantage from the paralysis than Miltank, and if you want a paralyzer who can outspeed anything; use Electrode, it's type is better for the job, Electrode outspeed anything without investment and even scarfers with it, and it's bulk is not that bad, he can take pretty decent hits and spread paralysis.
2. Don't use Block, either, Lickilicky can use better that move, why? If you want to trap something, that means you're sure your counters are out from play; Lickilicky have less counters, as Miltank is partially countered by special hard hitters, but Lickilicky doesn't, so, once you put out from the play it's counters, you can actually use Block at some degree, and start setting up whatever he may want, Belly Drum? Sword Dance? Go. Miltank have more problems to do that, so, a set focussed on Block + Setup is not efficient.
3. It's ok if you want to use Stealth Rock on her if you're not carrying Spin-Blockers, and you think you'll need to put it on the field more than one time, it's because Miltank is one of the bulkier and with less weakness users of Stealth Rock, so, you can use her as your main setter, and forgoe a Spin-Blocker, but actually, Mootility is already listed on the web, so, it's not a new or creative set, and Miltank without Milk Drink is not a good dedicated hazard setter as it's unique niche as Stealth Rock user. So, you can't be creative with Stealth Rock, you have to use Stealth Rock + Sap Sipper/Thick Fat + Milk Drink + Body Slam/Seismic Toss to being efficient at it, nothing new here, it's just like changing Choice Band for Life Orb.
4. She can use Curse to an extent (as long it's counters are put out from game), but, actually, Lickilicky is better at it the 99% of time. Miltank may have better abilities, but Lickilicky sports an a lot higher special bulky, a thing needed for a curser to work, and he does have Explode, and a 1-2+ STAB Explode will destroy anything not resistant or inmune to it, and while Lickilicky have to resort to Wish for healing, he doesn't need to heal to offen as Miltank, and finally, the extra speed of Miltank is somewhat useless with curse; right, you'll have an 1+ defense before the enemy attack you, but your foe will usually just switch-out to a special attacker and destroy you, and Lickilicky can back-up it's physical prowess with a special attack as coverage. Miltank can still be used with Milk Drink + Heal Bell + Return/Body Slam + Curse + Scrappy, but that set is already listed, and is still somewhat outclassed by SubCurser Lickilicky, still, it's not creative, and other Curse sets are totally outclassed by the listed on the web.
5. Even when it's listed on the web, Punishment should not be used on offensive sets without Choice Scarf, why? Simple; even when it's the unique physical move of Miltank to hit super effective to Ghost, it's just too weak without STAB, 60 is really low, and you can just use Rock Slide, who offer better general SE coverage, and had a nice flinch rate that Miltank can put on practice with it's high speed; or better, just use Scrappy. Now, why not on offensive sets? Simple: Nobody will setup on a offensive Miltank ever in it's live, because Miltank hits hard enough to make it not a good idea, and even if they do (2+), Return is still doing more damage to anything most of the time, and Rock Slide/Fighting moves offer better coverage than Punishment, and if you want to stop 4-6+ sweeps; know what, you will not, 4-6+ sweeps most of the time are by hands of some Attack + Defense, or Attack + Speed, a 4+ foe is still being more damaged by Return, and a 6+ will not being damaged good enough, or will just outspeed you and destroy you.
6. Heal Bell, mmm... this's relative, you can use this move on almost any Miltank set, but actually, you should not use it with Sap Sipper; most of the time, you'll want Sap Sipper to absorb Spore or Sleep Powder, and that doesn't make a great synergy, but even then is usable with Sap Sipper, but you should use other ability with Heal Bell if that's possible. Oh, yeah, if you use Heal Bell, have an attack, otherwise Audino will outclass you the 99% of time, why? Simple, Audino sports better special defense, almost the same physical defense, and strictly support Pokémon tends to switch a lot, so, Regenerator is almost a better ability for the job, and for Heal Beal stuff, you don't need speed at all, and last-ditch with Heal Bell is not the best of the plans. Also, mostly reserved to Heal Bell sets should be more focussed on physical defense, because if you want a special defensive or balanced defensive Heal Bealler, Lickilicky is a lot better at the job as he sports higher bulk and a bit more of attack (and even Wish).
7. Drink Milk is it's niche move, a nice move, should be considered always on any Miltank set.