const pokemon = {
  name: 'Squirtle',
  type: 'Water'
};

const { abilities = [], ...rest } = pokemon;
const fullSquirtle = { ...rest, abilities };

console.log(rest); //Result: { name: 'Squirtle', type: 'Water' }
console.log({ fullSquirtle }); //Result: { name: 'Squirtle', type: 'Water', abilities: [] }