Here's a good team for you: Your starter, Starmie, Hitmonlee, Sandslash, Ninetales, Pidgeot.
This team will cover all the basis for the best advantages only if you teach them the right moves for instance Starmie should have: Ice Beam, Surf, Thunderbolt, and Psychic. Doing this will ensure you can take out Lorelei, Bruno, and Agatha with just one pokemon!
Hitmonlee can also be used for Lorelei which is why I listed it along with Sandslash if you teach it Rock Slide.
Sandslash should be taught Earthquake for support on Agatha's Poison types that do not have Levitate like Arbok.
Ninetales is mostly here for support especially for the champion make sure to teach it Flamethrower and not Fire Blast.
Pidgeot same as Ninetales.
Whoever your starter pokemon is will also support whatever advantages they can take out. Venasaur in this list would be best only because I had already listed a water type (Starmie) and fire type (Ninetales).
By trade
Yes.
ya u can trade Pokemon in blue before u beat the elite four.
Ruby/Sapphire/Leaf Green/Fire Red/and i think Emerald. if not, trade from emerald to Ruby/Sapphire, and from ruby/sapphire to leaf green. You need to have the Sapphire and Ruby before you trade. you get these after the elite four.
You can trade from Sapphire anytime. However if you are trading to or from Leaf Green, you have to have beaten the Elite Four first, before you can trade with Ruby, Sapphire, or Emerald.
In the Pokemon Diamond and Pearl games, Spiritomb can be obtained either through the quest in which the player must have 32 interactions with friends, or through the Global Trade Station. If Spiritomb has been encountered by the player, such as through battling the Elite Four and then the Champion, then it can be requested in the GTS system for trade.
trade from fire red or leaf green
you can evolve scyther by making it hold a metal coat which you find after beating the elite 4.make scyther hold it and trade it but then trade it back to you to make it evolve.
you catch all the unown and then go to the ruin maniacs cave or you can beat the elite four and go to the resort arena and look through the grass. go to the elite four then get to the second of the elite four (I've beaten them-and Cynthia shes easy) the elite four bertha (second elite four) should have one but her first one is Quagsire hope that helped if it didnt stuff you!!!!!!!
you can't get it without trading, you have to trade from fire red or leaf green.
No,you may trade it from a friend who has it or have the listing in your Pokedex and obtain it through the GTS in Jublife City.
Yes,you can trade with perl,diamond,platinum and soul silver.You can trade before beating the elite four.