This thread seems pretty dead, but...
I've beaten the E4 and now I'm looking to build a complete team. This is what it looks like so far.
Serperior Lv.60
Arcanine Lv.56
Azumarill Lv.55
Tornadus Lv. 49 (Did end up getting that app. Meh)
Mamoswine Lv.65
Zoroark Lv.73 (I gave him Exp.Share for a few hours...)
I've grown pretty attached to Mamoswine and Arcanine and Zoroark's ability is too fun online. Serperior is alright, but I'm open to suggestions for a better grass type. Tornadus and Azumarill definitely need to go.
So, what's the best way to go for water and grass types? And what should I replace Tornadus with? Been thinking about Psychic something, but can't decide between Ralts, Gothita or Munna to train.
As you mentioned you play online, here's some Pokémon I like that aren't necessarily good in-game, but are fun to play against other people.
Also, you could build up your Join Avenue with beauty salons/dojos/cafés, use the salons to wipe your team's EVs, then EV them up properly and make your team a force to be reckoned with
Favourite Waters:
Quagsire - Dream World ability (Unaware) if possible. Send it in against things trying to set up, and laugh in their faces. You'll want at least Recover as an egg move (and possibly Curse if you want to really turn the tables).
Azumarill - it's actually amazing if you can get yourself a Huge Power one. Breed Aqua Jet onto it (or if you're feeling extremely daring, Belly Drum) and hit things for massive damage.
Favourite Grass:
Whimsicott - Encore with +1 priority is pretty crazy. Pick and choose the other three moves to cause as much grief as possible - your options include Leech Seed, Taunt, Stun Spore, Substitute, Tailwind.
Favourite Psychic: Sigilyph
Sigilyph - Avoid status conditions with Magic Guard + Flame Orb, screw physical attackers by burning them too with Psycho Shift, make yourself invincible with Cosmic Power and Roost, and finally start dishing out the pain with 260-base power Stored Powers. If you can get it in against something that can't kill it easily, it can demolish the opponent's entire team.
But if you just want raw power, there's Pokémon like Alakazam, Metagross, Gyarados, Roserade, Rotom, Kingdra, the Eevee evolutions, most starters, and of course legendary Pokémon.