Hi there !
My first contribution =)
How easily beat legendaries pets and get red panda / achievment.
Legendaries battles pets own hard us pets. So it's take many try to make them down.
I found a easy way to destruct them with no effort.
Take a beattle with this attack : Apocalypse.
Some pet with 'invulnerable turn protection' like :
-> When your pet is flying during one turn.
-> When your pet is under-swimming or under-flooring.
-> Repair.
-> Survival.
-> Undead pets. Rez one time.
-> Mechanical pets. Rez with 20% life.
-> Magics. Can get damaged more 40% lifes per turn.
And the great : -> Phoenix. He rez full life =)
So in fact u have to do that.
1. Launch Apocalypse.
2. Change your beattle because (HE MUST BE ALIVE TO APOCALYPSE WORK).
3. Use some survival capacity or tanking pet.
4. APOCALYPSE NOW !
5. Enjoy tiny cute red panda <3.
6. Excuse my poor english :'(