Pokémon Yellow does not have a slot machine or any gambling mechanics. It's a classic RPG where you capture and train Pokémon to battle others.
If you're thinking of other games like Pokémon Red or Blue, those games also don't have slot machines. The closest thing to gambling in the Pokémon franchise is the "Game Corner" in Pokémon Red and Blue, which lets you play various games for points that can be exchanged for rare items. However, even these games don't involve any real-world money.
Do you have any other questions about Pokémon Yellow or other games? 😊