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You know what happens when you design a Pokemon NPC to challenge the player? You get shit like Whitney. inb4 Whitney wasn't hard. There's a reason why she's the most infamous gym leaders for everyone who played GSC when it was new and that reason was her Miltank.
The obvious was Attract. Reason being is that it's a pseudo-paralysis that doesn't go away until you switch or you die. If you didn't account for catching a female Pokemon, something you NEVER HAD TO DO prior to this point, then that was a massive pain. But it gets better because Miltank also had Stomp which could flinch you. So that's 2 checks you had to get past if Miltank outsped you, which can happen very easily. And if somehow you got past all that shit then she could also heal herself with Milk Drink. Oh and she also had Rollout just to fuck with you and snowball into a gigantic threat.
For 8 year olds that play this game Whitney was a nightmare because her Miltank made sense. Now imagine if every Gym Leader and NPC was designed like this. Everybody under the age of 12, which is Pokemon's target audience, would drop the game.