So, you want to capture Entei and Raikou? Some things you should know.
- You can only RNG one of the roamers at the time.
- Go to the Burned Tower, go down the stairs, make 1 step left and save there.
- If you go for Raikou, advance to 1 frame before your Seed. If you want Entei, stop 6 before your Seed.
- When you are sure you got the right delay and you've advanced to the right frame, make another step left and release them. From here, you can save, and then go and find the roamers. :)