You should use a master ball.
master ball. but save it if you want it to use it on entei or raioku which run in the wild
weaken lugia down till it is almost dead than use a poke ball you will not catch it but then use an ultra ball and then you have lugia. PS. use the master ball on entei
A Repeat Ball.
If you're talking about Raikou, Entei, and Suicune,I used an ultra ball on Raikou and a dusk ball on Entei and Suicune.If you're talking about Articuno, Moltres, and Zapdos, I lowered down their hp and then used a dusk ball.
You should use a Master Ball or a ton of Ultra Balls and you might get lucky.
I captured mine with a poke ball use a weavile false swipe then use gengar hypnosics
Dusk balls
Ultra ball weaken it to red the easiest way is the dusk ball
well get a Pokemon that knows hypnosis and mean look and after u make entei a sleep switch your Pokemon that knows a TM that lowers entei acurracy note after u switch entei will flee now go to entei again use mean look and then use hypnosis start hitting him to the red and throw a pokeball at him afer u do hold down L and R because it improves the succes. now if u want to catch raikou do the same thign now if u don't want to use the flowing master ball ultra ball great ball or pokeball use a net ball i tried to catch raikou with a ultra ball and don't work so i used a net ball and it worked better than a ultra ball but i didnt catch it so i havent got entei or raikou but i know what to do yo catch him
first you go to the toilet in the Pokemon center. then talk to your mom.then say some bad words to someone and suddenly those three guys will appear in your house. you need to punch and kick them before you can use a poke ball but never use a poke ball, use a net in your house to catch it.
You should use it on either entei, raikou or scuicune if you pick squirtle ull have raikou if you pick bulbasaur ull have entei and if you pick charmander youll have scuicune
you have a special poke ball ( NOT ON THE GAME) which you can buy in toys R us and then connect it to your game then you can put Pokemon into you poke ball from your game and then you it will count how many steps you do and should make you Pokemon in the poke ball fitter (Hope this helps)