Why do so many 3-stage pokémon families just get bigger?

They don't. All of them have fundamental design changes. Is that not good enough though? Perhaps a cat should turn into a toaster and then a jellyfish so your ADD can be sated.
Hang yourself.

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If it aint broke dont fix it

>>32190384
A cat that turns into a cat-jellyfish would be kinda neat. Normal/Poison perhaps

>>32190384
>fundamental design changes
>"two gears" evolves to "three gears" evolves to "four gears"

>>32190437
So it isn't getting "just bigger" then is it?
Are you taking Clink and scaling it up? No, you're adding features, like the rotating piece and red shard on the gear.

>>32190473
Litterally the only thing added to klang after it evolves is a fucking ring, you can't defend this, nice b8 here's your (you)

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>>32190372
>>32190402
I prefer this one

>>32190384
>Comparing gears evolving into a clock like a cat into a toaster

Anyway I'd fine with the toaster too if the underlying concept was clever (which Klink line is not)