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>heading for your next gym badge
>your starters gotten some decent levels with the trainer battles
>get into said match ready to go
>its a good fight
>most of your useful pokemon for said gym are down/crippled except your starter
>it goes in, takes a hit but takes down the foe
>gets a level up and evolves mid battle
>gym leaders ace comes out
>time to show that full potential
It would be pretty intense and useful, especially in something like nuzlockes. Another thing they need to implement is only using as many pokemon as the gym leader has, so if the leader only has 3-4 you select the same amount and can only use those. When you have a full team and they have half a team, its not as good.
