How do you find Entei Raikou or Suicine on Firered and Leafgreen if their not registered in your pokedex?

Answer 1

Normally you would just go on any route and hope you find it in the grass (it helps to put Repel on) however here's an easier method:

Trade the dog that will appear in your game now here's how you determine which one you get. It depends on what starter pokemon you chose so let's pretend it was Charmander that means Suicune will be the dog that will appear. Squirtle is Raikou and Bulbasaur is Entei.

Besides Firered and Leafgreen you can trade one from Pokemon Colosseum only after beating the game and you must also purify it first of course. In order to trade you need the National Dex upgrade in Firered/Leafgreen and you had to have delivered the Ruby and Sapphire to Celio at the One Island Pokemon Center already. Trading takes place at Phenac City in the basement of the Pokemon Center remember a GBA to GCN cable is required for linkup communications and lastely ensure the Firered/Leafgreen game has been saved at a Pokemon Center with the pokemon party you want to trade for the pokemon in this case make it something simple like Entei for a Caterpie.

Once you actually receive the data you may return if you want because all you need is the data because now if you use your Pokedex and check the area of Entei or whatever dog it is you can find exactly where it is and it will be alot simpler to track down but remember it will always run away from its current spot meaning you need to "trick it" into running into the same route you chose rather than going to where it is at the current moment.

This is the easiest way possible but remember its all luck whether or not it will appear in your area so keep trying. There are some "hot spots" where they may show up frequently those are: Route 1, Route 4, and the route east of Celadon City.