so i know there's already a thread for serperior, but i feel like more people will see it here. lately i've been running anti-lead serperior.
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Serperior @ Leftovers
Trait: Overgrow
EVs: 252 Spd / 184 HP / 72 SAtk
Timid Nature
- Glare
- Knock Off
- Taunt
- Giga Drain
this thing is great. golem, golurk, and seismitoad are all scared shitless by it. this causes a ton of t1 switches, which is the perfect opportunity just to glare or knock off. in reality, golem has sturdy and golurk isn't even always 2hko'd by giga drain, but most people don't really take that into consideration because they know a taunt is incoming. 184 hp ev's is a leftovers numbers. i'd run a higher leftovers number with more hp but i added in about 30 SAtk ev's to help the golurk 2hko. the rest of the special attack is what's left over after hitting the leftovers number. i've been running 252 spd ev's just because, but i might bump it down to outrun base 105's. i've been thinking of running meadow plate, which guarantee's the 2hko on golurk, alomomola, 0.39% on wartortle, etc. i also might run hp rock for charizard and other rock types. hp ice is also a decent option.
i'd really recommend trying this set out. a t2 glare on charizard, jynx, scolipede, etc, can really turn momentum extremely in your favor, besides the fact that all those mons are now crippled.

Serperior @ Rock Gem
Trait: Overgrow
EVs: 64 HP / 192 SAtk / 252 Spd
Timid Nature
- Glare
- Hidden Power [Rock]
- Taunt
- Giga Drain
This is an alternate set I've been trying too. It beats Charizard, which is super nice. Unfortunately the thing about Serperior is it has mediocre SAtk. Seriously, it can't OHKO Charizard with 252 SAtk EV's and a Timid nature with HP Rock. So, Rock Gem. 192 SAtk EV's ensure a 2hko on Golurk. Rest was dumped into HP for bulk. You could also run 252 SAtk with Stone Plate. That OHKO's Charizard, along with 2hko'ing Jynx and Scolipede. Also has like a 20% chance to OHKO Scolipede after SR.
It sucks that Serperior's SAtk sucks so bad. :( im sad now.
miltank is such a mixed bag. it has great qualities but i feel it like it suffers intense 4mss and there are pokemon that do what it does better. (sr=metang, para=musharna, etc)