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the mindset behind difficulty hacks is not inspired by other rpgs. it's inspired by skill-based games. fighting games, shooters, what have you. enemies in those games are stronger because you're supposed to outmaneuver them, counter them, avoid their attacks.
you cannot do any of this in pokemon. you're locked in by the turn-based combat. damage and accuracy are decided by numbers and dice rolls. you're forced to be on the same playing field as your opponent. so, your opponent needs to be on the same playing field as you. and it's not like this is an absolute rule. an underleveled evolution here or a special move there is fine. but it's gotta stay within reason.