252 Atk Pure Power Mega Medicham High Jump Kick vs. 248 HP / 24 Def Starmie: 197-232 (60.9 - 71.8%) -- guaranteed 2HKO
4 SpA Starmie Scald vs. 0 HP / 4 SpD Mega Medicham: 99-117 (37.9 - 44.8%) -- guaranteed 3HKO
Starmie is definitely not handling Medi or "a number of other threats." Your only hope is to switch in on a weak move like ice punch, then pray that scald burns before he hits you. If scald doesn't burn, there's a chance you get 2hko'd by ice punch + hi jump kick after just 1 layer of hazards. And if you switch in on a hi jump kick, it's over before it even began.
Starmie is just outclassed this gen. Base 100 special attack is bad, and base 85 defenses are bad without investment. The only thing good is the speed -- which doesn't matter as much in this bulky meta unless you have power, defenses, or utility to back it up.
Cha no, don't knock it til you try it
btw the BulkMie set is just one of many, and even so those calcs aren't the greatest b/c Mega Medicham sure as shit ain't gonna stay in on risking getting clipped at the balls by Scald, but anyway I digress, here's the LO set against MegaCham:
252 SpA Life Orb Starmie Scald vs. 0 HP / 4 SpD Mega Medicham: 164-192 (62.8 - 73.5%) -- guaranteed 2HKO
also with Aegi gone, Starmie is now the #1 spinner so far as beating spinblockers goes, and Analytic means unless your name is Chansey or SDef Gastro good luck safely switching in to a LO Analytic boosted attack:
252 SpA Life Orb Analytic Starmie Psyshock vs. 252 HP / 252 Def Mega Venusaur: 252-299 (69.2 - 82.1%) -- guaranteed 2HKO
252 SpA Life Orb Starmie Psyshock vs. 252 HP / 252 Def Mega Venusaur: 198-234 (54.3 - 64.2%) -- guaranteed 2HKO
look at dem calcs, clean 2HKO on phys def Mega Venu, let's see that wanky Excadrill do that:
252+ Atk Mold Breaker Excadrill Earthquake vs. 252 HP / 252 Def Mega Venusaur: 127-150 (34.8 - 41.2%) -- guaranteed 3HKO
Hmmmmmmmmmm
Also les look at some top-tier shit, see how Starmie does there:
S-TIER:
252 SpA Life Orb Starmie Ice Beam vs. 4 HP / 0 SpD Landorus: 515-608 (160.9 - 190%) -- guaranteed OHKO
252 SpA Life Orb Analytic Starmie Scald vs. 252 HP / 4 SpD Mega Mawile: 192-227 (63.1 - 74.6%) -- guaranteed 2HKO (yeah I know Sucker Punch is a clean OHKO, that's not the point -- have fun switching into that)
252 SpA Life Orb Starmie Ice Beam vs. 4 HP / 0 SpD Thundurus: 257-304 (85.6 - 101.3%) -- 6.3% chance to OHKO (100% after SR)
252 SpA Life Orb Starmie Scald vs. 4 HP / 0 SpD Mega Charizard X: 164-192 (55 - 64.4%) -- guaranteed 2HKO (which, unboosted, Adamant Zard-X Dragon Claw fails to OHKO at full health, so lookie who wins 1v1 vs the one of the scariest mons out there)
A:
252 SpA Life Orb Analytic Starmie Thunderbolt vs. 252 HP / 4 SpD Azumarill: 333-393 (82.4 - 97.2%) -- 62.5% chance to OHKO after Stealth Rock (no free switch ins for you, Azu)
252 SpA Life Orb Analytic Starmie Scald vs. 4 HP / 0 SpD Bisharp: 247-292 (90.8 - 107.3%) -- 43.8% chance to OHKO
etc etc
My point being, Starmie is now the best offensive spinner in OU, yeah there's other shit like offensive Defoggers in the Lati twins and Exca's not bad either, but again they all check different shit and outside of hazard removal Starmie and Exca aren't even remotely comparable, with Aegi gone Starmie is the numero uno spinner in regards to beating spinblockers, which for an offensive spinner is a pretty big fckin deal. Starmie outspeeds and beats a lot of top-tier shit 1v1, and even what it doesn't (Bishart, MMawile), almost nothing can safely switch in to the LO Analytic set without taking massive damage. So to say Starmie is outclassed is, at this point, no longer true.