>>17285447When a Pokémon is captured, it is essentially transformed into an external form of the trainer extended towards the outside: his emotions, aspirations, afflictions, his virtue, and his character. It is for this reason that Pokémon cannot be considered "evil", as the fault of evil actions lies with the trainer who uses them for harm or wicked deeds.
Their essential purpose, before battles or competitions or games is to protect the trainer from harm. Like a king mated in chess, If the trainer dies or is killed, then they, too, die.