Tree's a Crowd (Japanese: キモリの森！巨大樹を守れ！！ Treecko's Forest! Protect the Big Tree!) is the 7th episode of Pokémon: Advanced.
Max argues with May that they have lost in the woods. May states that the Poké Navigator should show the right way, but it is out of energy. Brock says that Ash, Misty and him have lost many times and haven't made a single fight about it. Still, that does not amuse May or Max. Ash spots something moving in trees, which is a Treecko. Ash throws the Poké Ball to catch it, but the Treecko deflects it with his tail. May then says what Ash said to her: one must weaken a Pokémon to catch it successfully. Ash tracks the Treecko, who gets away. May then catches up to Ash, with Max and Brock following her. Ash runs and sees an enormous tree, but falls down, tripping over a root and sliding down a slope. Ash and Pikachu notice that it has no leaves- Suddenly, a Treecko throws a stick near them.
Ash challenges the Treecko to a fight, to which Treecko climbs the branches and spits the stick from his mouth to Pikachu and attacks pounds him. Pikachu is knocked out, while Treecko taunts him. Pikachu strikes more and more, while Treecko evades the attacks, until it pounds with its tail. Team Rocket spots the battle and dream how their boss, Giovanni, would live with the Treecko - being waken up by Treecko's tail, being massaged by Treecko etc. More Treecko appear, with an elderly one approaching the one who fought Pikachu. The younger than pushes the elderly one away. Meowth then translates what the elder one says - the huge tree will die, even if the younger one stays and will be alone. The younger replies that the it was born and lives among the tree's branches, wanting to protect its home. James and Meowth begin to cry, but Jessie isn't amused - to her, life is exchanging old for new things, for there must be progress.
All Treecko leave, except the one who fought Pikachu, so Team Rocket plans to take the Treecko away. The Treecko goes away in other direction, so Ash sees Pikachu on the branch and plans to catch Treecko by waiting among the branches. May, Brock and Max then have lunch, having no idea what Ash and Pikachu are doing. Max worries about Ash, so May orders to give her the food. Brock believes as long as Pikachu is by him, Ash is fine. Ash wants to catch Treecko, so has an idea - he brings Taillow so that Taillow will lead Brock, May and Max while he waits for Treecko. The Treecko comes with water, giving the water to the tree and setting a bush near it. Treecko repeats the process several times again, with Ash and Pikachu watching it doing.
Ash and Pikachu help the Treecko in reviving the tree. When they are coming back, the tree begins to shake; Team Rocket is taking the Treecko away. The machine knocks Ash and Pikachu, while Team Rocket departs with their balloon with the Treecko. Pikachu uses Thunderbolt, but Team Rocket have an anti-electrical balloon, which absorbs electricity, while they capture Pikachu. Treecko climbs and attacks the balloon with a stick, but without effort. James brings his Cacnea out to attack, but Treecko dodges. Treecko then jumps and attacks Jessie, and she accidentally presses a button to release the Treecko. The Treecko are rescued, and the Treecko taunts Cacnea, so Cacnea accidentally pierces the balloon. Pikachu and the Treecko land on a tree before Team Rocket's balloon blasts off.
The elderly Treecko then apologizes to the Treecko by waging his tail to the other one. Suddenly, the giant tree splits itself in half, but the Treecko push the tree not to fall down. However, the sun rises, and the tree shapes itself anew. It grows the seeds, which fall down, causing new trees to grow out. However, it turns out that the tree split itself and destroyed itself. The Treecko then tackles Ash and Pikachu, wanting to fight them. Brock, May and Max arrive to witness the battle. Pikachu uses Thunderbolt, but the Treecko evades all the attacks. One hits it, but the Treecko still stands strong. Pikachu uses Quick Attack, but as the Treecko dodges, Pikachu uses Thunderbolt, defeating the Treecko. Brock explains that when Treecko was in air, the Thunderbolt had much more effect, as usually electricity is absorbed into the ground.
Ash throws the Poké Ball and catches Treecko. Ash sends Treecko, and the elderly one gives him one of the seeds from the tree. The Treecko then plants the seed and goes with the gang to Rustboro City, who wave goodbye to the Treecko group.
- "You look like a Slugma!" - Max to May
- Oddly enough, May states that the Treecko is cute, while at Prof. Birch's lab she said that it was creepy.
- The "Who's that Pokémon?" is Girafarig.
- This episode's name is a pun to the statement "Three's a crowd".