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That's one annoying thing down.
"HEY LET'S BATTLE"
"Are you sure, we're pretty far in a cave full of very dangerous pokémons, what will we do if our teams are defea-"
"BATTLE"
For realism's sake, they could add trainers having slightly injured pokémons and balance that by giving them all 5-6 of them instead of the too frequent 2-3.