Ash comes to the circus. He makes a complete fool of itself. But he meets a guy who's equaly not liked. He says he needs an Exeggutor. Ash decides to get him one to be nice.
He finds a wild Exeggutor and manages to capture it. But then 450 Exeggutors show up. "Charmander flamethrower" it destroys all of them and evolves into Charmeleon.
He gives the man his Exeggutor. "I hope this helps" they both go their seperate ways. Ash's new Charmeleon is super excited.
(A/N Ash did legitimately defeat every gym leader, except Sabrina. So he does have enough badges for Charmeleon to listen)