Drexed said:
Machamp - Proven counter via revenge
Scizor - Get a decent attack scizor 20+ ivs will smack slak
Steelix - Notice how you said IF. who misses THAT many times?
Blaziken - Solar beam is potentially 2hko
Charizard - No explanation needed he can smack slaking with any sp attk he has
Heracross- Close combat, he's resistant to dark and fighting doesnt need to ohko slak
Rhydon - ill give you this one but only because of focus punch without it he would be scrap.
Muk - how don't you know about muk? it would be close though since muk is missing a few hard hitting attacks.
Nidoking/Nidoqueen - Yes "waaaayyy" Blizzard, ice beam, earth power all it needs to have an advantage over slak focus punch wouldnt really be a problem either because of its type coverage.
Feraligatr - Underestimated, can tear slak a new one he can either use superpower or spam icebeam either one will get the job done.
Typhlosion - its the same as char except he doesn't have coverage with fight types, still wouldnt make a difference flamethrower or solarbeam does the trick.
Swampert - same as feraligatr except hammer arm or ice beam but then again fera has higher base stats so this is debatable.
Blastoise - Underestimated, tanks all day Hydro pump, ice beam or blizzard and thats all she wrote.
Dragonite - You cannot be serious, Bulkier version of salamence minus the speed, flamethrower is all it needs. Did I also mention its a mixed attacker?
Salamence - he could be slower and still win with the type coverage
Togekiss - Aura sphere = game. crit is 160% of his health which would be hilarious to watch also other wise its a 2hko with slaking barley surviving the first one.
Mamoswine - Simply not fast enough and is weak to fighting you win this one also
For the most part slaking loses to these also didn't they remove focus punch as learnable? meaning it would have to be an older slaking to even use it, this list would be MUCH longer if thats the case, all these can be proven also.
Yes i know i didnt name a lot of the pokemon that can beat him easily, but most on this list aren't difficult to come by for the most part.
Please note that the following scenarios do not factor in critical hits, as they are unpredictable and should not be relied on to beat Slaking.
Machamp - can counter Slaking
Scizor - easily counters Slaking
Steelix - can counter Slaking, as long as it doesn't miss Sand Tomb several times
Blaziken - has zero chance of beating Slaking with its poor defense, and why would you even use Solarbeam (which will not 2HKO Slaking) when High Jump Kick does far more damage?
Charizard - only beats Slaking if its faster and Fire Spin doesn't miss
Heracross - also no chance of beating Slaking with its poor defense, and why does it matter that it's resistant to Fighting and Dark-type moves when Slaking has Slash to tear it apart?
Rhydon - hard to say about this one, but if Rhydon can tank 3 Focus Punches, then it wins
Muk - no chance to win against Slash
Nidoking/Nidoqueen - you're joking right? Once again, Slash destroys these two
Feraligatr - it takes 3 Superpowers for Feraligatr to KO Slaking (I know, I've tried with my shiny one), and it would take even more Ice Beams; Slaking wins again
Typhlosion - no chance since it lacks Fire Spin
Swampert - takes 3 Hammer Arms to KO Slaking, so no
Blastoise - yet another no chance
Dragonite - I am serious, serious that Dragonite has no hope of beating Slaking
Salamence - yet another loss
Togekiss - I have not tested this matchup, but unless you manage to 2HKO Slaking with Aura Sphere, Slaking will win, so I'll call this a toss-up for now
Mamoswine - no chance
Drexed, from reading your post, you clearly have forgotten that Slaking learns Slash, which it can use to destroy almost all of the Pokemon you said could easily beat Slaking. Slaking only uses Focus Punch on Pokemon weak to Fighting-type, and it only uses Punishment on Pokemon weak to Dark-type. Otherwise, it spams Slash on everything.
You also seem to think that any special attack can 2HKO Slaking, regardless of whether or not it gets STAB. That is a huge mistake. It is true that Slaking does not have great special defense, but it has massive HP and is more than capable of tanking 2 special moves from most Pokemon. My Slaking always tanks 2 Hydro Pumps from Starmie, and usually 2 Thunders from Jolteon. What makes you think Dragonite using Flamethrower, Feraligatr using Ice Beam, Nidoking using Blizzard, etc. could possibly stand a chance of easily beating Slaking as you have said? If you truly believe in your scenarios, then I suggest you test them yourself and you will see just how wrong you are.