The reason they don't in the other games.
It's tradition.
None of the starter Pokemon evolve by using a stone.
to evolve panpour which you get in the dream yard if you chose snivy as your starter but if you chose a different starter you get a different monkey (panpour, pansear and pansage) and will have a chance to get the stone to evolve it.
Happiny
You need a Shiny Stone to evolve into Cinccino.
Yes, you have to use a Shiny stone on it.
None of the starter Pokemon evolve by using a stone.
I know pansear does. you receive it if you have a water type starter.
lampent evolve litwick
You can evolve minnicino
Pansage will evolve by using a Leaf Stone into Simisage.
Petilil will evolve with a sun stone, pansage with a leaf stone, panpour with a water stone, and pansear will evolve with a fire stone.
minccino
you can't, you have to evolve it with a stone
to evolve panpour which you get in the dream yard if you chose snivy as your starter but if you chose a different starter you get a different monkey (panpour, pansear and pansage) and will have a chance to get the stone to evolve it.
mincino
pansear, pansage and panpour
Lampent to Chandelure.