They're unhappy. but not enough to run away. I don't like my job, but not enough to quit.
I need money, so I don't quit.
They get the comfort of having home(pokeball) and being taken to the pokecenter frequently. And apprently they enjoy fighting, so yeah. They must enjoy it enough to stay.
vola perfect excuse to have the feature.
Plus, what makes you think pokemon can actually escape/run away?
just beam them back whenever they try.
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