Hey there, I was a
Gen5NU player, and had some experience using Miltank in that metagame. Honestly, Miltank was just a pokemon in NU. She had no significant impact on the meta, but was a useable threat, who checked certain pokemon. During the Jynx meta was when Miltank truly shined though, as its ability in Thick Fat let it beat two of NU's strongest pokemon at the time, Jynx and Charizard. It also could use Sap Sipper or Punishment alongside a surprisingly effective offensive set, which actually packed a punch, and completely walled one of the most significant physical walls in NU, Tangela. Overall, Miltank had many roles in NU, but simply never had the chance to shine due to it being slightly outclassed by other pokemon at each role it had. Offensively it was eclipsed by Zangoose and Kangaskhan. Defensively by Audino, Lickilicky, and even Munchlax. However, Miltank's specific support which it offered, justified its usage on a variety of solid NU teams.
The two sets that were most seen in the metagame:
Mootility:
@ Leftovers
Ability: Thick Fat
EVs: 252 SDef / 252 HP / 4 Def
Careful Nature
- Body Slam / Seismic Toss
- Heal Bell
- Milk Drink
- Stealth Rock / Toxic
This set offered good utility as a cleric, and is the fastest stealth rocker available in Gen5NU, sitting at a surprising 100 base speed. It defensively offered the capability to beat common threats such as Jynx (now banned), and Charizard, as well as lesser used by equally threatning pokemon such as Simisear and Rock Polish Regice through the use of Thick Fat. It also acted as a solid cleric for offensively biased teams, while spreading status via body slam or toxic to aid more offensively oriented teammates.
Moofensive:
@ Life Orb
Ability: Sap Sipper
EVs: 252 Atk / 4 SDef / 252 Spd
Jolly Nature
- Double-Edge / Return
- Milk Drink
- Punishment
- Earthquake
This set was extremely underrated throughout the NU metagame, but is in my opinion the best set which Miltank can run. It was especially highlighted in Sweet Jesus's Smogoff normal spam team alongside BEAR. What is unique about offensive miltank, is that it is one of few pokemon which can hurt CM Musharna or NP Misdreavus at all, and its base 100 speed is 5 base points above NU's "golden speed" of 95, meaning that it also outspeeds and punishes the majority of offensive teams as well. It is also surprisingly strong, and can switch into grass type moves to gain an attack boost, walling some of NU's premier physical walls such as Tangela or Leafeon.
Tl;DR: Miltank wasn't that influential in NU and had minimal impact on the metagame but it was usable and was a notable threat.