Mine is my FireRed team:
Charizard, Vaporeon, Raichu, Alakazam, Machamp & Dugtrio
If u teach em the right moves it can defeat all types. U can also use it on red/blue/yellow, although it cant beat psychic on there & unless ur on yellow Charizard cant learn Flying moves. (For Yellow use Pikachu, not Raichu)
These first ten are the ten used for a local tourny(u were alowed 4 subs) so they are my strongest tht ive trained and will be for the frontier(when i get emerald)
Ruby team :
Sandslash <fave
Alakazam
Kingdra
Salamence
Metagross
scyther < slaking takes his place mostly even tho i personally disown it
subs:
Lapras < cheap otk experiment (horndrill,sheercold,rest,sleeptlk)
raichu <volt tackle , fun pokemon i never use
Slaking <even tho i hate the actual pkmn he is very helpfull in comebacks
Hitmonlee <reversaler, also got his butt kicked so he wasnt worth the effort
Emerald (future team to add to the other 10 frontierers)
exploud
mawhile
sableye
banette
cacturne
whatever is my starter < most likely ill use blazaken becaue i have no fire.
also will require a new tauros the one on my trainer card kinda got ditched half way thorugh ev training
my favorites team is full of UUs for the most part, but i love them. castform, bellossom, swellow, golduck, grumpig, and muk. i dont care about their merit in battle
If I had to combine all the teams I've ever had to come up with a favorite, it would be this one:
Lugia
Milotic, Lapras, or Starmie (I've never managed to decide between them!)
Houndoom
Salamence
Heracross
Jolteon
I have different teams for every Battle Frontier facility(of course the Battle factory, but the other ones too) but my favorite team would have to be both my Battle Dome ones combined.
Gardevoir
Swampert
Metagross and
Skarmory
Raichu
Swampert
^^