Who taught Goku the Kaioken?

King Kai The website for Dragon Ball Z: Battle of Gods states that ""King Kai teaches Goku the ""Kaio-ken"" and how to gather energy from the planet into one great fighting energy ball.

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Did Piccolo absorb all Namekians?

Saonel and Pirina absorbed most of the Namekians - most likely all of the other warrior class Namekians who had power to offer. And it's highly doubtful they'd ever allow themselves to be absorbed by Piccolo. There would be no reason for them to. Can Piccolo fuse with more Namekians? Just double the sum of the PL's of the two fusees. That is a lowball estimate. But that essentially means that Piccolo's power level is doubling each fusion no matter how weak the other Namekian is. At that rate, it wouldn't take many Namekians for Piccolo to be stronger than Frieza.

And another question, how old was king kold?

King Cold was said to have been born nearly three hundred years ago, though his parents are unknown. Little is known about his rise to power, except that he created the Planet Trade Organization when he was the young age (for his species) of fifty. Is Android 21 a canon? Android 21 was revealed to be included as a special appearance in Kakarot, and her new tie to the official canon of the series is that she's a young researcher that was recruited to help Bulma's father whip up a new kind of training machine.

Who killed Garlic Jr?

In Dead Zone, Garlic Jr. is defeated by Goku's four-year-old son, Gohan, showing Gohan's incredible talent for fighting. The saga details Garlic Jr.'s return and his desire for revenge, and with Goku and Vegeta absent, it is left up to the Z-Fighters to counter him alone. In Japan, the Garlic Jr. One may also ask why is garlic jr immortal? Garlic Jr. has some similarities to Piccolo, namely that he was reincarnated from another character and held a grudge against the person who doomed his father/past self (Goku regarding Piccolo, Kami regarding Garlic Jr.), and both even had a degree of immortality thanks to the Dragon Balls (Garlic Jr.