This an opinion question but I think the elephant is the best because it gives you +2 strength.
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In the Industrial Castle level after Pipistrello's Cave, there's a large enemy with the Cardinal animal orb, get the animal and go back to the Forest Entrance level with the owl in the beggining. The Cardinal will find it and give it to you. The Cardinal finds secret items in the game.
In the Industrial Castle level after Pipistrello's Cave, there's a large enemy with the Cardinal Animal Orb. The Cardinal finds secret hidden items. With the Cardinal go to the Full Moon level after Medusa's Lair. The Cardinal will find and give you the key in the second hut just before you go to the Snow World Level. The Key Sword opens the last door in the Animal Ark and unlocks the Berserker animal (he gives you a magic boost).
Let Palkia hold the lustrous orb, and let Dialga hold the adament orb. It boosts their special moves' damage.
the red orb gives you the chance to catch groudon and the blue orb gives you the chance to catch kyorge.
It is called the Griseous Orb.