Pokémon Crystal Cheats

Catch Suicune With Master Ball
First Rescue the Director from team Rocket. Then he say's to go to TIN TOWER DON'T GO THERE YET!!

Instead go to Blackthorn (After all the other dialogue) and get the master ball from Elm.

Then, you go to tin tower and catch Suicune with the Master Ball (If You want to, anyway)