In DP051, Paul released his Chimchar because he thinks it's not strong enough (as usual) and in DP052, Ash officially catches it when he asked Chimchar once again to be on his team, and Chimchar agrees, so he throws a Pokeball in the air, and Chimchae jumps in. :D
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Following Paul releasing Chimchar in episode 50 glory blaze and Ash offers it to join his team in episode 51 smells like team spirit and Delighted, Chimchar joins Ash.
ash's chimchar will evolve in a battle against Paul and chimchar will eventually collapse and faint against Paul's electabuzzit evolve in " evolvin strategies" and the number of the episode is 595
Ash's Chimchar evolves into a Monferno in Pokémon DP Galactic Battles episode 27. It is titled "Evolving Strategies". its ep 601
Ash receives Chimchar in the episode titled "Gettin' Twiggy With It!" which is the 52nd episode of the Diamond and Pearl series (Season 10). Chimchar was abandoned by its original Trainer, Paul, and Ash decides to take it under his wing. Chimchar eventually evolves into Monferno and then into Infernape, becoming one of Ash's most powerful and loyal Pokémon.
Ash got Charizard in episode 11