In Game or Post Game.
First Pokemon Take a Pokemon that can learn status moves or agility and has good defences Second Pokemon A Pokemon that can learn moves that can hit far away, like not the immediate tile and has a move that can attack all Pokemon at once, like Swampert ( it would be better with gap prober IQ skill) Third Pokemon A Pokemon specifically for healing that knows moves like wish or Heal Pulse Fourth Pokemon An all out attacker with offensive moves