Episode 32
Elephant's Memory and Memorium are two episodes where he has flashbacks to his childhood.
episode 5 season 5
The Sealed Sword Frenzy OVA. XD
Series 1, Episode 4: Francine's Flashback.
Actually, it's not an episode. It's a movie. It's called "Hell Chapter" Bleach movie four.
Elephant's Memory and Memorium are two episodes where he has flashbacks to his childhood.
Renji Abarai, when defeated by Ichigo a second time, has flashbacks of Rukia and himself when they were little kids. This is found in episode 32. Also, I think there is another flashback thing later on in the series when they are all going up against the Bounts. I forget what episode..If someone wants to improve my answer, feel free.
A flashback is realizing your childhood :):):):):):):):):) .
The meeting of the two characters take place in episode 16. =)
episode 64:New School Term, Renji has Come to the Material World?!
partly in 46 episode
Episode 127 and 128 in Shippuden
it was a flashback from an episode.
episode 5 season 5
The Sealed Sword Frenzy OVA. XD
Technically there was no episode where he learned it, but there is a flashback in episode 31
Series 1, Episode 4: Francine's Flashback.