Yes since its the maximum amount you can have in a party. You can of course raise more than 6 Pokemon as well you just switch Pokemon from the PC to raise whatever Pokemon you want. Of course you can raise less then 6 if you want i only raised 5 Pokemon in my yellow version.
6.
There are many Pokemon that you can have. You just have to switch them out in the PC when you want to.
hi i have all 16 badges and have beaten red 6 times i would recommend get your Pokemon levels to 50 and adding gravler and red gyardos then add rakiuo or enti.
Pokemon fire red how to have more Pokemon more than 6 Pokemon
it is in the dotted hole on 6 islland
In Pokemon Green loves Red
catch 60 Pokemon then talk to professor oak.
Saffron- Sabrina
Island 6 near the edge
6 magikarps
unless your 6 the answer should be obvious. OF COURSE YOU CAN TRADE!
As many as you feel you need (1-6) I'd recommend going to 6 though.