DragonBall episode 13. Goku becomes a great ape and puar transforms into a giant pair of scissors and cuts his tail off. i believe he grows it back later, but im not sure.
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i think it is in the 289, All Things Bright and Beautifly
i think it was after goku came back with his tail and turn ssj3 when he revert back to his old state goku look at the earth and become a golden great ape in episode 30. GOKU TURNED SSJ4 IN EPISODE 35, SHORTLY AFTER HE WAS A GREAT APE.
Because during his training with Kami in Dragonball, Kami pulled Goku's tail off and used his magic to make it unable to grow back because he thought his Great Ape form being unleashed at random times would be inconvinite.
pikachu learn iron tail at lvl 60
there is no tm for aqua tail.