Rainbow Pets - Only One Command

Hello! Today, I've recreated an old mod, rainbow pets! These are really cool pets that lay diamonds and more!

Click here for the command!

Tutorial:
To obtain a rainbow pet, you must throw a diamond block at a chicken. It will immediately transform
into a rainbow pet. To tame your rainbow pet, right click with bones (this uses wolf mechanics). You
can tell if it is sitting because it will emit smoke particles. Rainbow pets can hold items. Right click them
with the item you want them to hold and they will hold it. Right click again to get it back. Rainbow pets will
also lay diamonds every five minutes. They will also attack mobs you hit. To get rid of them, simply look straight
down when near them to get your diamond block back, whilst killing the rainbow pet.

Credits:
By Code202

Notes:
For 1.9