How do you catch reiku in Pokemon Crystal?

You can't catch Reiku in Pokemon Crystal! Reiku is a Pokemon introduced in Pokemon Ruby and Sapphire.

It seems you might be thinking of Raikou, a legendary Electric-type Pokemon that can be caught in Pokemon Crystal. Here's how to catch it:

1. Beat the Elite Four and become the Champion.

2. Talk to the old man in Ecruteak City. He'll tell you about the legendary beasts (Raikou, Entei, and Suicune) and their location.

3. Find Raikou's location. Its location changes frequently, and you'll need to check various areas to find it. The location of Raikou, Entei, and Suicune changes every day at midnight.

4. Find Raikou and prepare for battle. Raikou is a strong Pokemon, so be sure to have your best team ready.

5. Catch Raikou. Use your best Poke Balls and strategies to capture it.

Good luck!