Giratina's origin form

to get giratina you need to go to the distortion world and catch it but when you go back to your world it will change it's form to altered form

to keep it in it's original form you need to have giratina, beet the Pokemon league then go back to the distortion world and you will apper where you catched giratina,go down then you will see a pokeball go get it and it will give you the griseious orb now go back to your world again and give the griseious orb to giratina and it will change back to it's original form