Whats the most powerful summon animal in naruto/

[T0bidara]

Yeah. Cause you get to be as old as Katsuyu is by getting one shot.

only because no one has salt style.......

 

[Jericho Senju]

Nagato's Summons

 

[aldeatcu]

Pain's summon,the giant dog with many heads

 

[maniaoqan]

Gamakichi summons Naruto.
The end for every villian.

 

[AMIan]

Either Aoda (Manda II), a frog or one of Pein's summons.