just walk up to them
You have to defeat them.
go to cinnabar island and once you beat the Pokemon mansion Bill will come out and offer you to go with him to first island.
At the top of Mt Ember near one island. (Moltres is wild so save before you battle him).
first go make sure you have visited the gameroom on island 2. then go back to island 3 and you will be able to fight the bikers.
Growlithe is found in the Pokemon Mansion on Cinnabar Island in Pokemon Firered.
go inside the wireless adapter game corner on island two. trust me, it works. after u do u can battle the bikers on island 3
on cinnabar island
Beat the pokemon league.
Go to N00b Island. You will battle a Missingo. there. atch it. It has a hahahha noob attached.
There no Mew in firered.
you can get deoxys at birth island
in 1 island Pokemon center