>>53829424>gen 1Brock and Misty.
Brock is only true if you do Charmander or Yellow, but Starmie is just tougher, faster, stronger, and hits harder than anything you have by that point. Even Bulbasaur can get fucked if a bit underlevelled
Gen 2: Whitney and Clair
Miltank is the same gist as Starmie. Its numbers are just bigger than anything you have at this point, and you basically NEED to have gotten a Machop, or Geodude, or something to deal with it. Rollout specifically is kinda anti-player, because it punishes recovery items.
Claire's Kingra doesn't have the raw stats, but it's still strong, and no starter or welfare mon deals with it.
>Gen 3Flannery, and Norman in RS, Tate and Liza in E. Flannery gets fucked by Swampert (who doesn't), but will herself basically fuck anything that doesn't resist fire. It's hard to match her shitmon to team slot, you need to have a plan. RS Norman is kinda cracked unless you have Protect or Dig or something, his Slaking goes first, probably kills whatever it hits. and takes several hits. State and Liza are pushovers in RS, but in E, they will hard fuck anyone doing a mostly solo run, and can chew through teams like nothing
>gen 4Fantina in Platinum, her shit is just faster and hits harder than what else is available.
>gen 5Clay and Marlon. Excadrill is an absolute fucker for Clay, and if you don't KNOW Marlon is going to Shell Smash on you, you probably lose on the spot. Setup sweepers and shit.
>Gen 6 lmao
>Gen 7Uuuuuuh. Totem Wishiewashi and Lurantis are spooky. Do those count? And Ultra Necrozma.
>Gen 8Bea. Similar verse, Machamp is just better than anything you're likely to have at that point, and it's a decent Dynamax pokemon. It gets cucked by its Gigantimax making it worse, but, that's just how it is.
>Gen 9Lmao
So, it's usually a product of the ace just being much better than player options available at this time, basically requiring some countermeasure to be obtained, or overlevelling to match the stats.