Pokemon Sun and Moon will likely encounter the four Alola guardians in the game. Here are some tips on how to find and defeat the four guardians.
Tapu Bulu - The Ula'ula Guardian
The Ula'ula guardian, Tapu Bulu is a Grass-Fairy Pokemon. The Deity can be reached via the Haina Desert. Pokemon Sun and Moon players will need to travel Up then Right, Up again, Right then Left, Down and Up. Players must touch a statue located at the end of the Abundance Ruins in order to make Tapu Bulu appear.
Tapu Fini - The Poni Island Guardian
The Poni Island guardian, Tapu Fini is a Water-Fairy Pokemon. The Deity can be summoned by touching a statue located at the end of the Hope Ruins. Pokemon Sun and Moon players will need to acquire the services of Machamp as a Poke ride to the Hope Ruins.
Tapu Koko - The Melemele Guardian
The Melemele guardian, Tapu Koko is an Electric-Fairy Pokemon. The Deity is located at the end of the Conflict Ruins. Pokemon Sun and Moon players will have to bring their Alola Champion if they want Tapu Koko to come out. Players do not need to worry if they defeat the Melemele guardian by accident. They can return again to Conflict ruins to claim the Melemele guardian.
Tapu Lele - The Akala Island Guardian
The Akala Island guardian, Tapu Lele is a Psychic-Fairy Pokemon. Pokemon Sun and Moon players can find the Deity in Life Ruins which can only be reached by using Machamp as a Poke Ride. Touch the statue at the ends of the Life Ruins to summoned Tapu Lele for combat match.
Pokemon Sun and Moon - Home to 800 Pokemons
Pokemon Sun and Moon is not only the home of the four guardians, it also the home of 800 various Pokemon. Collecting them will take some time and will require the exhaustive exploration of the Alola Region and surrounding Islands.