Pegasus saves Sailor Moon and Rini first in episode 121 (128 in the original Japanese) when he listens to Sailor Mini Moon's desperate prayer for someone to help them and he bestows upon them their new transformation brooches, and Sailor Moon with the Kaleidomoon Scope wand.
Rini (Chibiusa in Japanese) first meets Pegasus in episode 121 of the Sailor Moon English dub, titled "Dreams Take Flight" (episode 128, "Meeting of Fate! The Night when Pegasus Flies" in the original Japanese). However, this is only in a dream.
In episode 128 of the dub "A Teacher's Lesson," Rini refuses the lure of becoming Pegasus' master from one of Tiger's Eye's Remless, and at the end of the episode, is trusted enough by Pegasus to receive the Stallion Rêve, with which she can communicate with Pegasus privately.
As Pegasus is a central character in the fourth season of the anime, it's possible that you're thinking of another episode completely, but "found" is a very general word, and Rini could be said to have "found" Pegasus in some form or another at multiple points throughout the season.
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Rini met Hotaru in the episode "Show Stoppers"
Sailor moon super S movie
Pegasus leaves Rini in Sailor Moon episode 157 (English dub episode 150, "Dream Believer") because he is unable to tell her more about himself, either because of the curse he is under or because it would put Chibiusa in danger. However, Super Sailor Moon helps restore Sailor Chibimoon's faith in herself and Pegasus once more, and Chibimoon is able to summon Pegasus in battle at the end of the episode.
Rini transforms into Wicked Lady in episode 78.
Rini's last appearance in the "Sailor Moon" television series is in the episode called "The Sweetest Dream. " It was the final episode of the Sailor Moon S series.
Darien and Serena find out that Rini is their daughter in episode 76 in the English dubbed version, and episode 83 in the Japanese original.
The episode is 158, season 4; "Pegasus Revealed" / "The Secret of the Pegasus! The Handsome Guardian of the Dream World"
It happens in episode 158 Pegasus Revealed hope this helps ;)
Rini first meets Pegasus in episode 128, season 4 "Dreams Take Flight" / "Meeting of Fate! The Night where a Pegasus Flies"
Chibiusa/Rini first meets Helios/Pegasus in Sailormoon SuperS. Japanese episode 128, An Unexpected Encounter! The Night Pegasus Performs His Steps. English episode 121, Dreams Take Flight.
Pegasus leaves Rini in Sailor Moon episode 157 (English dub episode 150, "Dream Believer") because he is unable to tell her more about himself, either because of the curse he is under or because it would put Chibiusa in danger. However, Super Sailor Moon helps restore Sailor Chibimoon's faith in herself and Pegasus once more, and Chibimoon is able to summon Pegasus in battle at the end of the episode.
Rini is a character from Sailor Moon, the daughter of Serena and Darien. Rini first appears as an older version of herself, or Wicked Lady, in episode 78.
Rini transforms into Wicked Lady in episode 78.
Rini's last appearance in the "Sailor Moon" television series is in the episode called "The Sweetest Dream. " It was the final episode of the Sailor Moon S series.
episode 76
English Episode 81
Darien and Serena find out that Rini is their daughter in episode 76 in the English dubbed version, and episode 83 in the Japanese original.
Rini turns into a teenager and Serena turns into a kid in episode 158, season 4. In this episode Serena wants to be a kid and Rini wants to be an adult so they get switched places. :)
They kiss in episode 16 and episode 33