* Game Version: Different versions of Pokémon games often have different item availability in shops. The specific items offered can vary based on the version you're playing.
* Specific Shop: It's possible that the Black City shop in your game version only carries a Leaf Stone. Some shops have limited inventory, while others may specialize in certain items.
* Game Progression: Some items in shops might only become available after you've progressed further in the game. You may need to complete certain events or reach a certain point in the story before other stones become available.
* Trading: You can potentially acquire other Evolution Stones by trading with other players. This is a common way to obtain stones that are not readily available in shops.
To find out for sure why you're only seeing a Leaf Stone, you'll need to provide more context:
* Which Pokémon game are you playing?
* Have you progressed far in the game?
* Have you checked other shops in the city or region?
Knowing these details will help determine why the shop's inventory is limited.