Yeah go for Focus Punch > Blast, given that Blast is a special attack, and Golurk is a physical attacker. Plus with Substitute that gives you the chance to hit the opponents with Focus Punch, by "focusing".
For Gardevoir, go for Signal Beam > Focus Blast. Otherwise Musharna is a lot harder to beat & might beat you if it has Signal Beam, and you can beat Probopass with Psychic anyway after CMing a lot. Plus the accuracy is shakey and you want something that can reliably hit the dark types that switch in & leftovers > LO because you'll be dying quickly otherwise.
Walrein is kind of out of place there. idk what it actually does for you other than randomly Toxic stall mons. However... the strong water attackers can definitely be an issue for you. If you wanna stall out your opponents and be able to do something to the stronger water attackers - aka special Samurott, Gorebyss and Ludicolo, you could add your own Ludicolo. Most people will play cautiously, allowing you to stall them and take on them. Physical Samurott can be an issue too but I'll cover that in a sec!
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Rain Dish
252 HP / 152 SpA / 104 SpD
Modest
- Scald
- Giga Drain
- Toxic / Ice Beam
- Leech Seed
That'll allow you to be able to take on Gorebyss, Samurott and opposing Ludicolo who will wear down damage faster. For physical Samurott it'll be a lot harder cause it can set up on you with Swords Dance with some of your other mons. You -could- give Miltank Body Slam > Seismic Toss, given you haven't given it Thunder Wave. That'll help you out with stronger Pokemon that try to set up on it. Things like CB Golurk can be annoying if you switch incorrectly, and generally Cinccino can be fast enough to Bullet Seed through Golurk if it misses for some reason, and and finish it off with Skuntank, and hit physical Samurott which requires setting up/luck to beat. As for placement, I'm not sure if Golurk is really necessary, given I can only really see it helping with opposing Skuntank and in which case Cinccino could hurt it badly with Tail Slap and Skuntank itself can't do much against Emboar, and honestly some of the other Golurk sets are better tbh. So I'd replace it with...
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Skill Link
4 HP / 252 Atk / 252 Spe
Jolly
- Tail Slap
- Rock Blast
- U-turn
- Bullet Seed
Either way that's about all I can think of right now off the top of my head! gl and all. I didn't cover EVs because... I'm sure PlatDude is bound to lmao.