"Giving life to other is considered a "good" act. Taking life from other is considered an "evil" act. Where then does a contradiction like Pain Split lie, if there is no absolute good or absolute evil?"
Pain Split (Japanese: いたみわけPain Split) is a non-damaging Normal-type move. It is one of the four moves taught by the priest in Polony City's Church of Kek.
Pain Split adds the current HP of the user and target Pokémon. It then divides this value by two and sets the HP of both Pokémon to the result (limited by each Pokémon's maximum HP).
Pain Split bypasses accuracy checks to always hit, unless the opponent is in the semi-invulnerable turn of a move such as Dig or Fly. It will fail if the target is behind a substitute.
The user adds its HP to the foe's HP, then equally shares the total HP.