Pokémon : S5 | E60 – The Ties That Bind

Ash is shocked to learn that his first-round opponent in the Victory Tournament will be against Gary, his long-time rival. After a sharp exchange with Gary, Ash is left enraged by Gary threatening to sweep him at the tournament. That night, back in his suite, Ash rummages through his backpack and shows his friends the smaller white half of the Poké Ball, and he proceeds to tell Misty and Brock the beginning of his and Gary's rivalry. It had been a few days before Ash first left to start his journey as a Pokémon Trainer. Fishing by a stream, he managed to hook a Magikarp, which proceeded to slap him in the face before landing back into the water. Gary, on the other side of the stream, taunted Ash for being unable to name any of Magikarp's attacks, including the Flail that was used on him. The two had liked the stream as a fishing spot, and this caused their rivalry to escalate. When both Ash and Gary caught a bite, both reeled in their lines but discovered that they had both hooked onto the same rusted Poké Ball. After a brief tug-of-war, the Ball broke in two. Though Ash was willing to accept that the "fishing battle" was a draw, Gary had declared it a loss, as "tying with Ash was just as bad as losing", a position that he continued to hold. Ash explains that he has kept his half of the Poké Ball as a good luck charm. He admits that losing to Gary and his Eevee had taught him that he wasn't ready to take him on at the time, but declares that he'll beat Gary. Misty reminds him that the next day is a rest day, with the Victory Tournament starting on the day after, so Brock advises Ash to use tomorrow to prepare his strategy.

The next day, Team Rocket reopens their newly expanded souvenir stand. Though Meowth tells Jessie that business might be slow over the rest day, James is confident that he can drum up some business by holding a one-day sale of limited edition collector's pins. Meanwhile, back in the suite, Misty is surprised to learn that Ash and Brock had buried themselves in books, preparing for Ash's match. Ash, for one, has not slept since last night. Brock is quick to point out that Ash is not as computer-literate as either himself or Misty, but has managed to get a webpage up on Gary, displaying data on ten of his Pokémon. However, the monitor crashes just as he is about to demonstrate his computer skills to Misty, so she suggests they take the opportunity to get Ash off the computer desk for breakfast.
(Source: Bulbapedia)