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Solgaleo has 152/150/95/90/93/100 stats.
Lunala has 100/90/93/150/95/152 stats.
Marshadow is a Psychic/Water type, with 100/90/152/95/150/93 stats. Its ability is a Shadow Tag clone. It knows the move "Planetwave Crash," which is a Water-type move that uses the users defense stat instead of their attack stat and the opponent's attack stat instead of their defense stat to calculate damage.
All three of their sig moves have 100 power each.
Magearna is the 100/100/100/100/100/100 pixie. Its ability is "Soul Heart" which is a Magic Guard clone, and it's sig move "Heart Blast" is a Fairy type clone of Overheat.
Zygarde Core has 108/81/90/61/65/75 stats and Aura Break.
Zygarde 10% has 108/95/101/71/85/120 stats and Aura Break.
Zygarde 100% has 108/150/161/91/105/95 stats and a new ability called "Perfect Aura." This ability nullifies all damage of Fairy and Dark type moves, boosts the power of Ground type moves by 30%, and devolves Mega evolved Pokemon when Zygarde is on the field. They cannot be re-evolved until it is off the field.
You change Zygarde's forms at an area called the "Balance Tree," located on the west island of Alola.