How can get the poke doll in Pokemon Crystal?

You can't get a Poke Doll in Pokemon Crystal! Poke Dolls are a new item introduced in later games, like Pokemon Diamond and Pearl.

In Pokemon Crystal, you can get a variety of other items that might be useful for battling or trading. Here are some ideas:

* Rare Candies: Increase a Pokemon's level by one.

* PP Ups: Increase the number of times a Pokemon can use a move before needing to rest.

* Protein, Iron, Calcium, Carbos, Zinc: Increase a Pokemon's stats.

* Evolution Stones: Help certain Pokemon evolve.

Remember, these are just a few examples, and there are many other items to discover throughout the game!