How d you catch suicune in fire red?

If you want a suiccune, your starter pokemon must be of the opposite element of the legendary dog you want. If you want Raikou, whicch is a fire type, choose Squirtle as your starter pokemon. If you want Entei, choose Bulbasaur as your starter. And if you want Suicune, start with a Charmander. After you defeat the elite four, just look around in the grass. It’s extremely hard to find one, as it is very rare to find it while looking for it. It appears randomly, anywhere in the grass. Once you find it, it will run away after you make one move. The only way to catch it would be to throw a master ball at it, or use a pokemon whose special ability prevents Suicune from escaping. Get its hp down to 1 or 2, put it to sleep, or paralyze it, and throw Timer or Ultra balls. Don’t even think of Pokeballs or Greatballs. If you can’t find it, just have fun in the game, go to different places, but go into as many grassy areas as possible and be prepared; keep your strongest pokemon who can prevent Suicune from escaping at the front, and always have loads of Ultraballs and Timerballs, and keep your Masterball with you as well.

A good choice for battling Suicune would be a strong Golbat who knows mean look and some powerful attacks. Use mean look first, to stop the pokemon from escaping then use strong attacks to get its hp down. If you can’t catch it, check Suicune’s location on the Pokedex and chase it. It’s location will keep changing, but don’t give up and keep looking for it. Try going to the area from different directions and look in the grass all the time. The easiest way, of course is to just throw a masterball at it once you find it. Hope this has helped you, at least this is how I caught my Suicune.