Here's why:
* Pokemon Indigo refers to the original anime series, which featured the Kanto region.
* Charizard is a Fire/Flying type Pokemon that evolves from Charmeleon, which evolves from Charmander.
* Charmander is a starter Pokemon available in the Kanto region, but it's not available in the anime series "Indigo League".
To get Charizard, you would need to play a Pokemon game set in the Kanto region, such as:
* Pokemon Red
* Pokemon Blue
* Pokemon Yellow
* Pokemon FireRed
* Pokemon LeafGreen
In these games, you can choose Charmander as your starter Pokemon and evolve it to Charmeleon and then Charizard.