So with the spotlight on how great Mega Slobro's defensive set up sets will be I'd like to introduce a more immediate offensive approach,
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M-Slowbro @Slowbroite
100Hp/252SpA/156SpD
Nature: Modest
Moves
-HydropumpSurf
-Flamthrower
-Hp Grass/Psychic
-Calm Mind/Ice Beam
The thought process behind this set is that most people will be assuming a full Def+ set up slowbro and thus will either send out a phazer/taunter or powerhouse special attacker. With this set you aim to hit hard right off the bat with its now great 130 base SpA. Power that rivals heatran. The aim of the ev's are to ensure you survive practically any special attack at + 1 save choice specs SE stab moves coming >125 spA which also means you serve as an effective lure for those kind of pokemon, calcs below (+1 is assuming you calm mind on the switch):
Common Offensive Switch Ins:
252 SpA Life Orb Thundurus Thunderbolt vs. +1 100 HP / 156 SpD Slowbro: 250-296 (70.2 - 83.1%) -- guaranteed 2HKO after Stealth Rock
252+ SpA Magnezone Thunderbolt vs. +1 100 HP / 156 SpD Slowbro: 218-258 (61.2 - 72.4%) -- guaranteed 2HKO after Stealth Rock
252 SpA Raikou Thunderbolt vs. +1 100 HP / 156 SpD Slowbro: 182-216 (51.1 - 60.6%) -- 89.1% chance to 2HKO
Slowbro's Retaliation:
+1 252+ SpA Slowbro Hydro Pump vs. 4 HP / 0 SpD Raikou: 297-349 (92.2 - 108.3%) -- guaranteed OHKO after Stealth Rock
+1 252+ SpA Slowbro Flamethrower vs. 172 HP / 0 SpD Magnezone: 352-416 (108.6 - 128.3%) -- guaranteed OHKO
And Against Some Bulky Phazers/taunters
+1 252+ SpA Slowbro Hydro Pump vs. 248 HP / 220+ SpD Heatran: 420-494 (109 - 128.3%) -- guaranteed OHKO
+1 252+ SpA Slowbro Hydro Pump vs. 252 HP / 104+ SpD Mew: 243-286 (60.1 - 70.7%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
+1 252+ SpA Slowbro Ice Beam vs. 248 HP / 0 SpD Celebi: 324-382 (80.3 - 94.7%) -- 50% chance to OHKO after Stealth Rock
These are just a few examples of what an offensive slowbro can do with 1 calm mind. It's moveset of Hydro/flame/hpgrass is basically an offensive fwg core breaker. You do have a bit of 4mss though, you could forgo HP grass for another stab (best for hitting dragons and water types neutral) give up power and go all out attack with icebeam instead of calm mind, or any combination really. Let me know what you think!
Edit: I have been informed Slowbro can not learn Hydro Pump :(
Main differences in the calcs below using surf:
+1 252+ SpA Slowbro Surf vs. 4 HP / 0 SpD Raikou: 243-286 (75.4 - 88.8%) -- 12.5% chance to OHKO after Stealth Rock
+1 252+ SpA Slowbro Surf vs. 252 HP / 104+ SpD Mew: 199-235 (49.2 - 58.1%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
The rest of the common offensive switch ins should either be hit harder by Ice beam HP grass or Flame thrower.
Meh that set can't function fren, the best set for mslowbro is the classic, slack off psychic scald fireblast/twave/cmind
Mega-Slowbro haven't regenator, have the ability for not give critical hit.