Spiritual Pokemon: Everyone has at least one spiritual Pokemon at birth that gives them some personality characteristics, Pokemon moves, special abilities, and weaknesses based on type (ex: Gold's spiritual Pokemon is Raichu. He can use electric-based powers and very fast. He does not do well when a person or a Pokemon use a Ground type move on him, or if he's stuck in land-based disasters). The Spiritual Pokemon can not be legendaries or Ditto. Most abilities can be used alone, but more efficient when using a weapon. Use of most abilities many times will exhaust the user, even to the point of death.
The spiritual Pokemon are not naturally evolved when a person is born, it evolves as the person grows, or if the spiritual Pokemon requires an evolutionary stone to evolve, the person simply touches the required stone. Evolving helps increase their abilities. Training helps to strengthen the abilities and quicken evolution.
Spiritual Pokemon, while often just regarded as part of the person that is the source of special abilities, can actually be their own self. They are guardians of a person and the "voice" in their heads. Bonding with the Spiritual Pokemon is recommended, as it helps increase your abilities. Spiritual Pokemon can be summoned out of the person's body if they have a strong bond, or if they're affected by a spell. The Pokemon can go long distances away from their human body and communicate with their person telepathically. They can be summoned back into the body anytime, unless something bad happens.
Pokemon: Many people don't have the many varieties of Pokemon, and only domesticated some Pokemon, which are usually used for work or kept as pets. Those however, who have different varieties of Pokemon, usually have Poke Flutes, items made of works of magic and science and able to call Pokemon they have befriended. Those that have a spiritual Pokemon that matches the Pokemon they befriended are better connected, and can even communicate telepathically regardless of typing. People cannot communicate to Pokemon however, but those with Psychic type spirits or other Pokemon spirits that have special abilities are able to communicate with them. It is very rare for a human that is not a Psychic spirit or Pokemon with special abilities spirit to be able to speak to all Pokemon.
Pokeflutes: There are many types of Pokeflutes, from the most common that usually only calls one Pokemon, to the rarest, the Regional Pokeflutes, given by the region's sage. These flutes are held by the Pokeflute Owners, able to befriend and call more Pokemon than the other types of flutes and able to give the person insight of another person's spiritual Pokemon/s or the Pokemon they encounter.
Magic: Magic is quite prominent in this world, and said that Arceus created magic while creating the universe, and is especially wielded by Ho-Oh to grant eternal happiness, Jirachi to grant desires of people, Cresselia to grant good dreams, and Darkrai to defend itself by nightmares. Magic has its limits however, as whatever it makes is temporary and cannot make food and money. People of Fairy, Psychic, or with special abilities spirits (ex: Ninetales) are natural wielders of magic, but magic is usable to everyone.
Aura: Aura is the spiritual energy of every living creature and a part of the soul. It is very acknowledged in this world, as there are people who can sense them thanks to their Pokemon spirits. There is often confusion between aura and magic, as this is justified since both are very similar from being able to control a living thing. However, while magic can only affect aura, Aura users can control the whole soul. An example is that the worst a magician can do to a person is make them insane or control them to kill themselves, and an Aura user can tear someone's soul out of their bodies, giving them a painful death.