This cluster fuck of infuriating tactics are what stops me from laddering
ladder sucks. dont ladder.
but you should know how to deal with these things
Stuff like double intimidate - always make sure you account for landoT on your teams with at least one counter and one switch-in preferably more if possible. Such as a LandoT of your own or another intimidate mon like Gyarados or scrafty; Wide Guard checks LandoT. Other good mons vs LandoT are bulky waters particularly RotomWash. Also if double intimidate is a huge problem you probably have too many physical attackers.
thunder wave - have an electric and/or ground mon to switch in. also have a slow mon that doesnt mind taking a Twave like Amoonguss. have a mon with guts like Conkeldurr
baton pass setup - hyper offense prevents them from getting into position to set up. Taunt is easy check. Unorthodox counters are haze and roar/whirlwind.
wil-o-wisp - 90% of your teams should have a fire mon. and if you have a fire mon and you still have wisp problems you may have too many physical attackers
snarl - I'm guessing that the problem is more that you are unable to take out snarl users such as suicune. always have ways to beat bulky waters if suciune is a problem
shadow tag - hyper offense, uturn/volt switch, taunt. bring your own mega gengar.
after you play for long enough you will have mental check list of things you need to beat and building a solid team that doesnt have terrible match ups vs these things will not be difficult