So i havnt been on in awile and im a bit rusty, i started my emerald from scrathc and im wondering, who is the best ppl out there that can be used in battle frontier? I dont have a connector cable so ppl like alakazam wont be good to use.

Also if you can put down a suggested skillset for each person that would be greatly appreciated

Use the following for a good head start:

Latios - Modest - Twisted Spoon

Psychic-Ice Beam-Thunderbolt-Solarbeam/Recover

EV's
252 Sp. Attack
126 Sp. Defence
126 Speed

Metagross - Modest - Kings Rock

Psychic-Sludge Bomb-Earthquake-Meteor Mash

EV's
252 Defence
126 Sp. Attack
126 Attack

Salamence - Lonely - Leftovers

Fire Blast-Earthquake-Dragon Claw-Brick Break

EV's
252 Attack
126 Sp. Defence
126 Speed

This should help you get a head start.

I need to work on my Metagross. xD

Its tough not being able to trade you could try some of these guys

Metagross is a good choice.

In addition I'd also say

Salamence
Sceptile
Milotic
Armaldo
Mightyena