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>What if Stat ups were limited?
What you see a lot of times in Singles is one Pokemon maneuvering into a position where they can repeatedly raise their Stats into the stratosphere, setting themselves up to sweep the oponent's whole team. This is boring to watch and takes a million years to play through.
Solutions to this exist in moves that reset Stat changes or force our Stat boosted Pokemon, but a better strategy could be to prevent the degenerate game state in the first place
What would happen, for instance, if Stat Changes had a time limit? If a Nasty Plot only lasts for 3 turns then you can't spend a million turns just cranking up your Special Attack because by the time you actually use it'll expire. This would also work the other way too: if stat reductions were limited then overpowered Abilities like Intimidate get nerfed because they don't permanently slash offensive options just by hitting the field.
Alternately:
>What if Stat Moves didn't stack?
What if you can't repeatedly Quiver Dance to get godlike stats? You do it once and get its affect, and doing it again doesn't keep boosting your Stats. This also addresses issues like Evasion being so widely disliked in Showdown: if a Pokemon can only Double Team *once* it's impossible to drop your foe's chances to hit to single digits.